Fil'ly, n.

noun

[Icel. fyl, colt, Dan. föl; W. filog, filawag, a young mare or filly, a wanton girl. See FOAL.] 1. A young horse; especially, a young mare; a female colt. Neighing in likeness of a filly foal. Shak. 2. A lively, roistering, or wanton girl. Addison.