- The definition of jaw is the two hinged bones that frame the mouth and hold the teeth.
An example of the jaw is the hinged body part at the bottom of the face used for chewing.
Looking up at the human jaw.
jaw definition by Webster's New World
- either of the two bones or bony parts that hold the teeth and frame the mouth in most vertebrates: the mandible () is usually hinged and movable, the maxilla () is usually not
- any of various analogous biting structures of invertebrates
- the mouth
- either of two mechanical parts that open and close to grip or crush something, as in a monkey wrench or vise
- the narrow entrance of a canyon, valley, strait, etc.
- something grasping or imminent: the jaws of death
- Slang a talk
Origin: Middle English jowe ; from Old French joue, cheek
jaw definition by American Heritage Dictionary
- a. Either of two bony or cartilaginous structures that in most vertebrates form the framework of the mouth and hold the teeth.b. The mandible or maxilla or the part of the face covering these bones.c. Any of various structures of invertebrates that have an analogous function to vertebrate jaws.
- Either of two opposed hinged parts in a mechanical device.
- jaws The walls of a pass, canyon, or cavern.
- jaws A dangerous situation or confrontation: the jaws of death.
- Slang a. Impudent argument or back talk: Don't give me any jaw.b. A conversation or chat.
- To talk vociferously; jabber.
- To talk; converse.
Origin: Middle English jawe, jowe, perhaps from Old French joue, cheek.
- jawˈless adjective
jaw - Medical Definition
- Either of two bony structures that form the framework of the mouth and hold the teeth.
- The mandible or maxilla or the part of the face covering these bones.
- jawless adjective
jaw - Science Definition
- 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.
- Any of various structures of invertebrate animals, such as the pincers of spiders or mites, that function similarly to the jaws of vertebrates.