- orthopygium
- orthŏpygĭum, ĭi, n., = orthopugion, the rump and tail feathers of birds, Mart. 3, 93, 12 (al. orrhopygium = orropugion, of the same meaning).
Lewis & Short Latin Dictionary, 1879. - Revised, Enlarged, and in Great Part Rewritten. Charlton T. Lewis, Ph.D. and Charles Short. 2011.