a. 在后的, 其次的, 后面的

n. 后部, 臀部

[医] 后的, 后面的

Posterior \Pos*te"ri*or\ (p[o^]s*t[=e]"r[i^]*[~e]r), a. [L.
posterior, compar. of posterus coming after, from post after.
See {Post-}.]
1. Later in time; hence, later in the order of proceeding or
moving; coming after; -- opposed to {prior}.

Hesiod was posterior to Homer. --Broome.

2. Situated behind; hinder; -- opposed to {anterior}.

3. (Anat.) At or toward the caudal extremity; caudal; -- in
human anatomy often used for {dorsal}.

4. (Bot.) On the side next the axis of inflorescence; -- said
of an axillary flower. --Gray.