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  • WordNet 3.6
    • n diameter the length of a straight line passing through the center of a circle and connecting two points on the circumference
    • n diameter a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: It would take approximately twenty-four trees that are on average six to eight inches in diameter to produce one ton of newsprint for the Sunday edition of the New York Times
    • Diameter (Geom) A diametral plane.
    • Diameter (Geom) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve.
    • Diameter (Arch) The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.
    • Diameter The length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: A maple tree is usually tapped when the tree is at least 45 years old and has a diameter of 12 inches
    • n diameter In geometry, a chord of a circle or a sphere which passes through its center; in general
    • n diameter a chord of a conic cutting it at points tangents to which are parallel;
    • n diameter a line intersecting a quadric surface at points where the tangent planes are parallel. The conception was extended by Newton to other algebraic curves by means of the following theorem: If on each of a system of parallel chords of a curve of the nth order there be taken the center of mean distances of the n points where the chord meets the curve, the locus of this center is a straight line, which may be called a diameter or the curve.
    • n diameter The length of a diameter; the thickness of a cylindrical or spherical body as measured, in the former case on a diameter of a cross-section made perpendicular to the axis, and in the latter on a line passing through the center: as, a tree two feet in diameter; a ball three inches in diameter. In architecture, the diameter of the lower face of the shaft of a column, divided into 60 parts, forms a scale by which all the parts of a classical order are commonly measured. The 60th part of the diameter is called a minute, and 30 minutes make a module.
    • n diameter The diameter (see def. 2) of the object observed, taken as a convenient measure of linear magnification used in micros-copy and in telescopic work.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: An adult esophagus can range from 10 to 14 inches in length and is one inch in diameter
    • n Diameter dī-am′e-tėr the measure through or across: a straight line passing through the centre of a circle or other figure, terminated at both ends by the circumference
    • ***


  • Samuel Johnson
    “You teach your daughters the diameters of the planets and wonder when you are done that they do not delight in your company.”


Webster's Revised Unabridged Dictionary
F. diamètre, L. diametros, fr. Gr. ; dia` through + measure. See Meter
Chambers's Twentieth Century Dictionary
Through Fr. and L. from Gr. diametrosdia, through, metrein, to measure.


In literature:

They were composed of tubes, each about two feet long and eighteen inches in diameter.
"A History of Art in Chaldæa & Assyria, v. 1" by Georges Perrot
At length, in 1839, two specula, each three feet in diameter, were turned out in such perfection as to prompt a still bolder experiment.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
Therefore let the diameter of the Sun be to the diameter of Venus as 30' to 1' 12''.
"The Astronomy of Milton's 'Paradise Lost'" by Thomas Orchard
Connect opposite points of the outer circle by drawing two more diameters.
"Construction Work for Rural and Elementary Schools" by Virginia McGaw
The actual diameter of the moon is about 2163 miles, which is somewhat more than one-quarter the diameter of the earth.
"Astronomy of To-day" by Cecil G. Dolmage
But in reckoning magnifying power, diameter, not area, is always considered.
"Pleasures of the telescope" by Garrett Serviss
First a block of wood is cut about the same diameter as the internal diameter of the stack.
"Boys' Book of Model Boats" by Raymond Francis Yates
The spores globose, 8-10u in diameter.
"The Mushroom, Edible and Otherwise" by M. E. Hard
They are about one foot in length and may be had from two to six inches inside diameter.
"Rural Hygiene" by Henry N. Ogden
The diameter of the semicircle is about 18 ft., and it is floored with mosaic.
"The Shores of the Adriatic" by F. Hamilton Jackson
The oval grave pits were from 4-1/2 to 6 feet deep and from 3 to 4 feet in greatest diameter.
"Ancient art of the province of Chiriqui, Colombia" by William Henry Holmes
As the diameter of the mat increases, the less often is it necessary to add.
"Philippine Mats" by Hugo H. Miller
Other things being equal, a bulb is valuable according to its vertical diameter.
"The Gladiolus" by Matthew Crawford
Masts of 35 inches diameter, 35 yards long, L110.
"Glimpses of the Past" by W. O. Raymond
Total length of animal 1.3; diameter of peduncle .4 of an inch.
"A Monograph on the Sub-class Cirripedia (Volume 1 of 2)" by Charles Darwin
Trees that I set out in the spring of 1885 measure six to ten inches in diameter.
"The Apple" by Various
In size they range from less than one inch in diameter and depth to more than twenty inches in diameter and a foot in depth.
"Ancient Pottery of the Mississippi Valley" by William H. Holmes
The largest Douglas firs are sometimes over 400 years old and 60 to 70 inches in diameter.
"The Forests of Mount Rainier National Park" by Grenville F. Allen
Cut a circle six to six and a half inches in diameter, using as guide a pie-tin or cardboard, if a regular cutter is not at hand.
"The Century Cook Book" by Mary Ronald
Can the same method be used to find the diameter of the sun?
"A Text-Book of Astronomy" by George C. Comstock

In news:

Why is the diameter size of a pressure safety valve outlet line bigger than the inlet line.
The intersection of Sand Hill Road and Sharon Park Drive in Menlo Park was closed for several hours Aug 28 as crews repaired a large hole — about 12 feet in diameter — that opened up during a construction mishap.
Woll has introduced a Diamond Plus Induction 8-inch diameter sauté pan.
This end mill from Performance Micro Tool is 0.0004 inch in diameter.
In 2006, the company added a Kason recycle screening deck atop the existing screener, boosting its capacity from 100-150 gpm to 225-250 gpm without increasing its diameter.
Diameter Oscillation of Axonemes in Sea-Urchin Sperm Flagell.
It's a permanent seal and takes care of holes up to 6mm in diameter, which is probably a larger area than you think.
The diameter and position of the shackle prevent unauthorized entry from pulling the cylinder, core or plug.
Look past the OEM shift boot or cover that surrounds the main stick and check the diameter.
An optical instrument that scans and measures openings and wire diameters, the system supports sieves up to 18 in.
) in diameter and 100 mm long, in 14 hours in the case of C- or A-plane sapphire.
Specimens of plastic pipe and tubing with outside diameters greater than 4 in (101.6 mm) shall be mounted in accordance with Section 6.2.
(762-mm) diameter, a 220-grit square-edge diamond wheel, an adjustable squeegee -clamping system, a spring-steel platform sliding of squeegees for uniform sharpening, vacuum removal system, and more.
Kore expands large diameter handlebar offerings.
diameter in a variety of bright and happy glazes.

In science:

The growth of patterns, i.e. vortices and density clusters, is controlled by diffusive modes, and typical diameters, Lv (τ ) of these patterns grow as √τ .
Asymptotic Energy Decay in Inelastic Fluids
In order to apply the Arzela-Ascoli theorem, it is enough to show that the diameters of the images of the mi are uniformly bounded.
A norm on homology of surfaces and counting simple geodesics
Since the lengths of mi approach lh, it follows that the diameters of all the components of mi, for i sufficiently great, are uniformly bounded by 2lh .
A norm on homology of surfaces and counting simple geodesics
Trumpler based this on his study of open clusters in which he compared the luminosities and distances of open clusters with the distances obtained by assuming that all their diameters were the same.
Cosmic Dust in the 21st Century
CMS solenoid magnet (inner diameter of 5.9 m).
Studies of the Response of the Prototype CMS Hadron Calorimeter, Including Magnetic Field Effects, to Pion, Electron, and Muon Beams
This structure has, however, the disadvantage of its size (outer diameter 430 mm). Since some structures at the upstream end will have to fit into focusing solenoids, we are now also studying a slotted iris structure with an outer diameter of only 174 mm as an alternative.
Design of a 3 GHz Accelerator Structure for the CLIC Test Facility (CTF 3) Drive Beam
In order for this filter to work effectively, substantial waveguide length is required. This lead to an outer diameter of the 3 GHz TDS of approximately 430 mm.
Design of a 3 GHz Accelerator Structure for the CLIC Test Facility (CTF 3) Drive Beam
By fitting the liquid and gas densities to the law of rectilinear diameters, we extrapolate the critical point at Tc = 0.418 and ρc = 0.134.
Phase Behavior of a Simple Model for Membrane Proteins
By fitting ρgas and ρliq to the law of rectilinear diameters, we extrapolate the critical point at βc = 2.392 and ρc = 0.134.
Phase Behavior of a Simple Model for Membrane Proteins
By the isoperimetric inequality for the square in the lattice Z2 (see ), A′ has l1 diameter at least cI √q tn for some constant cI > 0.
On the mixing time of simple random walk on the super critical percolation cluster
PP), mats of irregular PP fibres with various fiber diameters (between 15 and 33 µm) and foams of different material type: PP, polyethylene (PE) and Rohacell (RC).
Prototype tests for the ALICE TRD
Average pulse height as function of the drift time for pions and electrons for a radiator of 17 µm diameter fibres at the momentum of 1 GeV/c.
Prototype tests for the ALICE TRD
We show in Fig. 5 the drift time distribution of the average pulse height summed over the adjacent pads, hP H i, for pions and electrons in case of a fibre radiator with 17 µm fibre diameter (X=0.3 g/cm2).
Prototype tests for the ALICE TRD
In a separate study we have found that the fibre diameter influences very little the TR yield.
Prototype tests for the ALICE TRD
Radiators with fibres with 17 and 33 µm diameter show similar TR performance for the same density and thickness (see Fig. 7 below).
Prototype tests for the ALICE TRD