The bone that forms the lower or upper part of the mouth where the teeth are set, especially the lower jaw. It helps you chew and speak.
A compound of “jaw,” from Old English “ceace” or “ceowe,” and “bone,” from Old English “bān.” Both parts are ancient Germanic words. Putting them together simply names the bone of the jaw.
Jawbones are so strong that some ancient stories describe them being used as weapons. Your jawbone moves every time you talk, chew, or yawn, quietly doing complex 3D motion without you noticing. It’s one of the busiest bones in your body, even though you rarely think about it by name.
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