Penna | Webster's Dictionary of the English Language

penna
penna or pinna (old forms, pesna, petna, Fest. p. 205, 209 Müll.), f. [orig. different words, penn...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
penna
penna ae, f PET-, a feather, plume (on a bird; often confounded with pinna): pennarum taurum nitor...

An Elementary Latin Dictionary