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The Collaborative International Dictionary

Pleurotoma \Pleu*rot"o*ma\, n.; pl. L. Pleurotom[ae], E. Pleurotomas. [NL., fr. Gr. ? the side + tomh` a cut.] (Zo["o]l.) Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmid[ae]. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit.