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  • WordNet 3.6
    • n incisor a tooth for cutting or gnawing; located in the front of the mouth in both jaws
    • ***
Webster's Revised Unabridged Dictionary
    • a Incisor Adapted for cutting; of or pertaining to the incisors; incisive; as, the incisor nerve; an incisor foramen; an incisor tooth.
    • n Incisor (Anat) One of the teeth in front of the canines in either jaw; an incisive tooth. See Tooth.
    • ***
Century Dictionary and Cyclopedia
    • n incisor pl. incisors, incisores (-sorz, in-sī-sō′ rēz). In anatomy and zoology, an incisive or cutting tooth; a front tooth; any tooth of the upper jaw which is situated in the premaxillary or intermaxillary bone, or any corresponding tooth of the lower jaw. The name was originally given to those teeth which have sharp edges and a single fang, and are situated in front of the canines of either jaw. It is now technically used of teeth, whatever their character, which are situated as above described. When there are no upper incisors, the lower incisors are those situated nearest the symphysis of the lower jaw. Incisors are technically distinguished chiefly in mammals. Most mammals possess them in both jaws. The typical number is 6 above and below; but this number is frequently reduced to 4 or 2, sometimes to none, in one or both jaws. The number in either jaw is always even, and there is usually the same number in each jaw. A striking exception to this is seen in the ruminants, which usually have only lower incisors, biting against a callous pad in the upper jaw. (See cut under Ruminantia.) Among the most highly specialized incisors are those of the rodents or Glires, which are perennial, persistently growing from open pulps, with fangs rooted through much of the extent of each jaw, and with the cutting edges beveled like an adz; teeth of this character are sometimes termed gliriform. (See cut under Rodentia.) In dental formulæ an incisor tooth is designated by the letter i. An incisor of the milk-dentition, or deciduous incisor, is designated di. See cut under tooth.
    • incisor Same as incisorial: as, an incisor tooth.
    • incisor Of or pertaining to the incisor teeth: as, incisor nerves.
    • ***
Chambers's Twentieth Century Dictionary
    • Incisor a cutting or fore tooth
    • ***


  • Walter Bagehot
    “Writers like teeth are divided into incisors and grinders.”


Webster's Revised Unabridged Dictionary
Chambers's Twentieth Century Dictionary
Fr. inciser—L. incīdĕre, incisumin, into, cædĕre, to cut.


In literature:

There is a large space between the outer incisors and the front grinders.
"Little Masterpieces of Science:" by Various
Sometimes both the lateral incisors are absent and the middle ones are of excessive size, a peculiarity which recalls the incisors of rodents.
"Criminal Man" by Gina Lombroso-Ferrero
The click of Mr. Jonas's incisors upon incisors chopped the air.
"The House of Fulfilment" by George Madden Martin
But the Carthaginian slightly curled her upper lip, revealing only her little white incisors.
"The Scarlet Banner" by Felix Dahn
The two lateral incisors will also have given place to permanents.
"The Pig" by Sanders Spencer
The front surface of the incisors has a broad, shallow groove.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various
The incisor line is curved, the outer teeth being placed posteriorly to the others: lower incisors inclined forwards.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
The incisors are large and chisel shaped, for cutting roots.
"Science of Trapping" by Elmer Harry Kreps
The front teeth are small, sharp, and chisel-edged, and are well adapted for cutting purposes; hence their name incisors.
"A Treatise on Physiology and Hygiene" by Joseph Chrisman Hutchison
The incisor is compressed laterally, more so than in any Recent heteromyid.
"A New Species of Heteromyid Rodent from the Middle Oligocene of Northeast Colorado with Remarks on the Skull" by Edwin C. Galbreath
Among these were two front incisors, which were filled on the lower edge.
"Great Mysteries and Little Plagues" by John Neal
On the surfaces of the incisors are the depressions, or "cups," by means of which age is determined.
"A Guide for the Study of Animals" by Worrallo Whitney
The summits of the incisors were infolded to a small extent.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7" by Various
BATOKAS, knocking out two upper incisors, ii.
"The Descent of Man and Selection in Relation to Sex" by Charles Darwin
The molars and incisors were of the ordinary dimensions and character of second teeth.
"Scenes and Adventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas" by Henry Rowe Schoolcraft
Two days old: Covering of fine brown hair readily discernible on dorsal surface; lower incisors protruding about .5 mm.
"Aspects of Reproduction and Development in the Prairie Vole (Microtus ochrogaster)" by Henry S. Fitch
The upper incisor teeth are generally marked by grooves.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7" by Various
Incisor sectioning requires only incisors and appears to be much more accurate.
"Ecological Studies of the Timber Wolf in Northeastern Minnesota" by L. David Mech
Certain of the incisor teeth are pulled out.
"Encyclopaedia Britannica, 11th Edition, Volume 15, Slice 6" by Various
There are no canines, a toothless space being left between the incisors and molars on each side.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg

In news:

Even though they weigh more than 100 pounds and have incisors the size of golf tees, capybaras are docile herbivores.
Sure, the Talbot's-clad mom at the next table is sporting a diamond the size of your incisor.
Those little slivers of trivia get trapped in Will Pearson's brain like shreds of spinach wedged between his incisors.
Perhaps one reason that we see so many aesthetic treatments of maxillary incisors and so few treatments of mandibular incisors is that most of us simply dislike treating these tiny teeth with their odd rootcrown transition.
1 Both anatomically and in a dental patient's perception, the maxillary central incisors are front and center in a smile.
An extra tooth between the incisors could be forming behind the scenes, keeping them apart.
If a labial frenulum, tissue that attaches the middle of the upper lip to the gum, passes between the incisors, it can keep them from closing.
They appeared in January—swarms of mantis-like creatures with serrated incisors and onion-bulb-shaped heads.
Forcing my top lip over my incisors, I walk under the chic Steakhouse Sixty8 sign and into the airy angles of the newly opened establishment, ready to empower my inner animal in a way that only a steakhouse allows.
The only teeth are upper incisors.