callipygian

(-pī'gəs)
adj.
Having beautifully proportioned buttocks.

[From Greek kallipugos : kalli-, beautiful (from kallos, beauty) + pugē, buttocks.]

(kal-uh-PIJ-ee-uhn)

adjective
Having well-shaped buttocks.

Etymology
From Greek calli- (beautiful) + pyge (buttocks)

Two related words are: dasypygal: wordsmith.orgwords/dasypygal.html steatopygia: steatopygia.

Usage
"And it hasn't been lost on modern film directors that a nice set of tights can showcase the callipygian assets of a well-formed leading man." — Heroes in Hosiery; South China Morning Post (Hong Kong); Jul 20, 2006.

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having beautiful buttocks