A filly is a young female horse. The male equivalent of a filly is a "colt."

In most places, a filly is not yet four years old, although sometimes a female horse younger than five is considered a filly. Before she is a year old, a filly is also called a "foal," or a baby horse — and between the ages of one and two, she's also a "yearling." Around 1400, the word was spelled fyly, possibly from the Old Norse fylja, the feminine of foli, or "foal."

Definitions of filly
  1. noun
    a young female horse under the age of four
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    type of:
    an animal that produces gametes (ova) that can be fertilized by male gametes (spermatozoa)
    a young horse
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