(bound form) tooth; teeth; refers specifically to the organs in the mouth used for chewing, as in 牙齿 yá​chǐ

the jaw or jawbone of a vertebrate, including the upper jaw and lower jaw; also the mouthparts of certain arthropods used for grasping or chewing

To rectify or straighten out a mistake, posture, or physical defect; to cure or adjust through treatment.

(bound form) a subject or branch of study; often used as a suffix for -logy, -ics, or -science