from Greek καλλίπῡγος (kallipygos), (adj.) from καλλι- comb. stem of κάλλος beauty
+ πῡγή buttocks: the name of a famous statue of Venus'
a 1800 - The Callipygian Venus
From: Historical Illustrations of the Fourth Canto of Childe Harold:
Containing Dissertations on the Ruins of Rome
By John Hobhouse, 1818
Stanza LXXX. Time, war, flood, and fire have dealt upon the seven-hilled city's pride.