freemartin

1. A freemartin or free-martin (sometimes martin heifer) is a female bovine with a masculinized behavior and non-functioning ovaries. Genetically and externally the animal is female, but it is sterilized in utero by hormones from a male twin, becoming an infertile partial intersex.1
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2. Lesbian.

I didn't know she was a freemartin.

by Frobert April 14, 2008