Emily Dickinson Lexicon

FREE-MAR'TIN, n.

When a cow produces twins, one of them a male, and the other apparently a female, the latter is most generally (but not invariably) barren; and, on dissection, will be found to have some of the organs of each sex, but neither perfect. Such an animal is called by the English a freemartin, and was called by the Greeks and Romans ταυρα, taura.