Emily Dickinson Lexicon

MON'O-DON, n. [Gr. μονοδους, having one tooth or shoot.]

The sea-unicorn, a cetaceous mammal, which has a remarkable horn-like tusk projeeting from its head. There is a rudiment of another tusk, but only one of them is usually developed. It is called also the monoceros, or horned narwhal. Its usual size is from sixteen to twenty feet. Curvier. Encyc.