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Webster's Dictionary (1865)

En'to-mo-stōm'a-tă, n. pl.

nounplural

n. pl. [Gr. ἔντομος, cut into, and στόμα, mouth.] (Zo-ol.) A family of mollusca, mostly marine.

An engraved illustration of two shells, with a large ridged, spiny shell on the left and part of a rounded shell on the right.
Entomostomata.