Definition of: posterior

(pos·tir′ē·ər) adjective
1. Situated behind or toward the hinder part: opposed to anterior.
2. Coming after another in a series; especially, subsequent in point of time; later: in this sense opposed to prior.
3. Bot. Situated or growing on the side next the parent axis: the posterior side of an axillary flower.
4. Zool. In the direction of the tail; caudal.
5. Anat. Dorsal.
—noun Often plural The buttocks. [<L posterior, comp. of posterus following <post after]