名词

1. 臀部；屁股
Some-one's bottom can be referred to as their posterior .

2. 背部的；后部的
Posterior describes something that is situated at the back of something else.

1. a tooth situated at the back of the mouth

Synonym: back tooth

2. the fleshy part of the human body that you sit on

e.g. he deserves a good kick in the butt
are you going to sit on your fanny and do nothing?

Synonym: buttocksnatesarsebuttbacksidebumbunscanfundamenthindquartershind endkeisterpratrearrear endrumpsternseattailtail endtooshietushbottombehindderrierefannyass