Faecula | Webster's Dictionary of the English Language

faecula
faecŭla (also fēcŭla, and contracted faecla, Cael. Aur. Tard. 2, 1), ae, f. dim. [faex], burnt tar...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
faecula
faecula or fēcula ae, f dim.faex, burnt wine-crust, salt of tartar , H. ...

An Elementary Latin Dictionary