From Latin corpus (body). Ultimately from the Indo-European root kwrep- (body, form) that is also the source of corps, corpse, corporation, corset, corsage, and leprechaun.

I love that there is almost always one word in the list that makes me do a double take, like the Sesame Street song "one of these things is not like the others." What on earth is that leprechaun doing in there?