filly definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
noun pl. fillies
- a young female horse, specif. one under five years of age
- Informal a vivacious young woman or girl
Origin: Middle English filli ; from Old Norse fylja, feminine of foli, foal
filly definition by American Heritage Dictionary
noun pl. fil·lies
- A young female horse.
- Informal A lively, high-spirited girl or young woman.
Origin: Middle English filli, from Old Norse fylja; see pau-1 in Indo-European roots.