Definition of "filly" []

• A young female horse. (noun)
• Informal A lively, high-spirited girl or young woman. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""If a filly is as good as a colt, they ought to compete," said Jackson."
• "I think the filly is a better horse than Mine That Bird, bar none."
• "Trainer Chip Woolley, who will have Mike Smith ride Mine That Bird after Borel opted for the filly, is quietly confident that his slightly built horse can do it again."