Webster’s Revised Unabridged Dictionary · 1913
Chiton
Chi′ton (kī′tŏn), n. [Gr. χιτών a chiton (in sense 1).] 1. An under garment among the ancient Greeks, nearly representing the modern shirt.
2. (Zoöl.) One of a group of gastropod mollusks, with a shell composed of eight movable dorsal plates. See Polyplacophora.