Emily Dickinson Lexicon

U'NI-CORN, n. [L. unicornis; unus, one, and cornu, horn.]

1. An animal with one horn; the monoceros. This name often applied to the rhinoceros.
2. The sea unicorn, called narwal, is of the whale kind, and is remarkable for a horn growing out at his nose. Cyc.
3. A fowl. Grew. Fossil unicorn, or fossil unicorn's horn, a substance used in medicine, a terrene crustaceous spar. Cyc.