Emily Dickinson Lexicon

MOC'CA-SON, n. [Am. Indian word. Algonquin, makisin.]

1. A shoe or cover for the feet, made of deer skin or other soft leather, without a sole, and ornamented on the upper side; the customary shoe worn by the native Indians.
2. A poisonous water serpent of the southern United States, called by naturalists Trigonocephalus piscivorus.