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hypostome |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Hypostome \Hy"po*stome\, Hypostoma \Hy*pos"to*ma\, n. [NL. hypostoma, fr Gr "ypo` beneath + ? mouth.] (Zo["o]l.) The lower lip of trilobites, crustaceans, etc