Chiton \Chi"ton\, n. [Gr. ? a chiton (in sense 1).]

1. An under garment among the ancient Greeks, nearly representing the modern shirt.

2. (Zo["o]l.) One of a group of gastropod mollusks, with a shell composed of eight movable dorsal plates. See Polyplacophora.

Source: Webster's Revised Unabridged Dictionary (1913)