Jaw (noun)

1. Each of the bones in the human face that form the mouth and support the teeth.
2. Either side of the mouth and the bones surrounding it.

Origin:

Old english ceáwe, from proto-germanic *gahewō (compare dutch kaak, german kiefer), from proto-indo-european *ǵʰeh₂w- "jaw".

Examples:

1. She rubbed her jaw, which was sore from clenching her teeth in her sleep.
2. The dentist checked the alignment of his patient's jaws.
3. The jaw of the crocodile was wide enough to swallow a grown man whole.
4. The impact caused his jaw to break and required surgery.
5. The horse's jaw was lathered with foam from the bit.