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  • WordNet 3.6
    • adj biconcave concave on both sides
    • ***
Webster's Revised Unabridged Dictionary
    • a Biconcave Concave on both sides; as, biconcave vertebræ.
    • ***
Century Dictionary and Cyclopedia
    • biconcave Hollow or concave on both sides; doubly concave, as a lens. See lens.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Biconcave bī-kon′kāv concave on both sides.
    • ***


Webster's Revised Unabridged Dictionary
Pref. bi-, + concave,
Chambers's Twentieth Century Dictionary
L. bi-, twice, and Concave.


In literature:

The bodies of the vertebrae, also, are not deeply biconcave, but are flat, or only slightly cupped.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
The vertebrae of its backbone are not biconcave, but flat in front and behind.
"The Whence and the Whither of Man" by John Mason Tyler
The human blood-corpuscle is a non-nucleated, biconcave disc, having a diameter of about 1/3500 of an inch.
"Aids to Forensic Medicine and Toxicology" by W. G. Aitchison Robertson
The red globules appeared cleanly circular, flattened, biconcave, and without notches, indentations or spheroidal swellings.
"The Man With The Broken Ear" by Edmond About
In satisfactorily prepared dry specimens =the red blood corpuscles= keep their natural size and shape, and their biconcavity is plainly seen.
"Histology of the Blood" by Paul Ehrlich
Its form is that of a biconcave disk.
"A Civic Biology" by George William Hunter
The end result is an amphicoelous or biconcave centrum in general appearance much like that of the Selachian.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3" by Various

In science:

In the isotonic phosphate buffer, before adding the salt mixtures to make it hypertonic, the cells were biconcave disk shaped (discocytic) - as expected (Fig. 1(a)).
Optical tweezer for probing erythrocyte membrane deformability
Minimum energy of bending as a possible explanation of biconcave shape of human red blood cell. J.
Biological and synthetic membranes: What can be learned from a coarse-grained description?