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jaw
(redirected from jawless)

    Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.06 sec.

jaw

Either of two bones that frame the mouth: a movable lower jaw (mandible) and a fixed upper jaw (maxilla). These hold the teeth (see tooth) and are used for biting and chewing and in speech. Vertical portions at the back of the lower jaw form hinge joints at the temples. The front of its arch thickens to form the chin. The upper jaw is attached to bones at the bridge of the nose, in the eye sockets and roof of the mouth, and the cheekbones. It contains the large maxillary sinus.
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? Mentioned in ? References in periodicals archive
 
Scientists know little about the emergence of these sophisticated immune systems about 500 million years ago, which occurred as vertebrates evolved from jawless into jawed creatures.
Hints of primitive antibodies. (First Line of Defense) by Marzuola, C. / Science News
Expect everything from empty bird's nests and a langouste la Parisienne to a pyramid of jawless skulls.
Impressionist Still Life by Rosenblum, Robert / Artforum International
Lampreys are modern, jawless descendants of those early fishes.
Ancient Estrogen Finding the mother of all hormones by NETTING, JESSA / Science News
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