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A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them. [Written also Gnathostomata.]

ticulation where a hard part is received into the cavity of a bone, as the teeth into the jaws.

The dense tissues which invest the teeth, and cover the adjacent parts of the jaws. Gum rash (Med.), strophulus in a teething child; red gum. -- Gum stick, a smooth hard substance for children to bite upon while teething.

One of a group of plectognath fishes (Gymnodontes), having the teeth and jaws consolidated into one or two bony plates, on each jaw, as the diodonts and tetradonts. See Bur fish, Globefish, Diodon.

Any slender, marine fish of the genus Hemirhamphus, having the upper jaw much shorter than the lower; -- called also balahoo.

n rodent (Cricetus frumentarius). It is remarkable for having a pouch on each side of the jaw, under the skin, and for its migrations.

nychteuthis. -- Hook wrench, a wrench or spanner, having a hook at the end, instead of a jaw, for turning a bolthead, nut, or coupling.

nal beetle of the genus Lucanus (as L. capreolus, and L. dama), having long, curved upper jaws, resembling a sickle. The grubs are found in the trunks of old trees.

d in Egypt and Asia at a very early period. It has six broad molars, on each side of each jaw, with six incisors, and two canine teeth, both above and below. The mares usually have the canine teeth rudimentary or wanting. The horse differs from the true asses, in having a long, flowing mane, and the tail bushy to the b…

n the Asiatic side. In the breeding season the male has a large dorsal hump and distorted jaws.

Pertaining both to the hyoidean arch and the mandible or lower jaw; as, the hyomandibular bone or cartilage, a segment of the hyoid arch which connects the lower jaw with the skull in fishes. -- n.

Between the hyoid bone and the lower jaw, pertaining to them; suprahyoid; submaxillary; as, the hyomental region of the front of the neck.

Having the maxilla, or lower jaw, longer than the upper, as in the skimmer.

One of the teeth in front of the canines in either jaw; an incisive tooth. See Tooth.

Under the lower jaw; submaxillary; as, the inframaxillary nerve.

Between rami or branches; esp., between the mandibles, or rami of the lower jaw; intermandibular.

The cheek; the jaw. [Written also jole, choule, chowle, and geoule.] Cheek by jowl, with the cheeks close together; side by side; in close proximity. "I will go with three cheek by jole." Shak. " Sits cheek by jowl." Dryden.

- called also key seat. -- Key wrench (Mach.), an adjustable wrench in which the movable jaw is made fast by a key. -- Power of the keys (Eccl.), the authority claimed by the ministry in some Christian churches to administer the discipline of the church, and to grant or withhold its privileges; -- so called from the…

e joint (Mach.), a hinge joint, in which a projection with an eye, on one piece, enters a jaw between two corresponding projections with eyes, on another piece, and is retained by a pin which passes through the eyes and forms the pivot. -- Knuckle of veal (Cookery), the lower part of a leg of veal, from the line of th…

A group of rodents, including the hares. They have four incisors in the upper jaw. Called also Duplicidentata.