1 [jaw]
either of two bones, the mandible or maxilla, forming the framework of the mouth.
the part of the face covering these bones, the mouth, or the mouth parts collectively: My jaw is swollen.
jaws, anything resembling a pair of jaws or evoking the concept of grasping and holding: the jaws of a gorge; the jaws of death.
one of two or more parts, as of a machine, that grasp or hold something: the jaws of a vise.
any of two or more protruding parts for attaching to or meshing with similar parts.
Often, jaws. Also called throat. Nautical. a forked piece at the end of a gaff, fitting halfway around the mast.
idle talk; chatter.
impertinent talk.
verb (used without object)
to talk; chat; gossip.
to scold or use abusive language.
verb (used with object)
Slang. to scold.

1325–75; Middle English jawe, jowe < Old French joue; origin uncertain

jawless, adjective
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2 [jaw] Scot. and North England.
a swelling wave of water; billow.
verb (used without object)
(of liquid) to surge, splash, or dash forward, as in waves.
verb (used with object)
to pour or splash (liquid).

1505–15; perhaps akin to jaup

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
jaw (dʒɔː)
1.  the part of the skull of a vertebrate that frames the mouth and holds the teeth. In higher vertebrates it consists of the upper jaw (maxilla) fused to the cranium and the lower jaw (mandible)Related: gnathal, gnathic
2.  the corresponding part of an invertebrate, esp an insect
3.  a pair or either of a pair of hinged or sliding components of a machine or tool designed to grip an object
4.  slang
 a.  impudent talk; cheek
 b.  idle conversation; chat
 c.  moralizing talk; a lecture
5.  slang (intr)
 a.  to talk idly; chat; gossip
 b.  to lecture
Related: gnathal, gnathic
[C14: probably from Old French joue cheek; related to Italian gota cheek]

jaws (dʒɔːz)
pl n
1.  the narrow opening of some confined place such as a gorge
2.  the jaws a dangerously close position: the jaws of death

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., "the bones of the mouth," perhaps from O.Fr. joue "cheek," from Gaulish *gauta "cheek," or perhaps a variant of words related to chew (q.v.). Replaced O.E. ceace, ceafl. Slang for "to speak" since 1748; hence 19c. U.S. slang jawsmith "talkative person" (1887). Jawbreaker "word hard to pronounce"
is from 1839.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

jaw (jô)

  1. Either of two bony structures that form the framework of the mouth and hold the teeth.

  2. The mandible or maxilla or the part of the face covering these bones.

jaw'less adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
jaw   (jô)  Pronunciation Key 
  1. Either of two bony or cartilaginous structures that in most vertebrate animals form the framework of the mouth, hold the teeth, and are used for biting and chewing food. The lower, movable part of the jaw is the mandible. The upper, fixed part is the maxilla.

  2. Any of various structures of invertebrate animals, such as the pincers of spiders or mites, that function similarly to the jaws of vertebrates.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Snakes eat everything whole, often dislocating their own jaws as they stuff
  their prey-sometimes alive-into their mouths.
One of the tricks was for his dogs to beg with cigarettes in their jaws.
We owe both the lever system in our jaws and small bones in our ear to our
  shark ancestors.
Their jaws don't have enough stiff cartilage to withstand the stress of
  chomping on large prey.
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