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... invertebrate zoology) Any of the marine snails of the family Trochidae characterized by a spiral conical shell with a flat base.

... the genus Trochus or family Trochidae.(a.) Top-shaped; having a flat base and conical spire; -- said of certain shells.(n.) The curve described by any point in a wheel rolling on a line; a cycloid; a roulette; in general, the curve described by any point fixedly connected with a moving curve while the moving curve rolls without slipping on a second fixed curve, the ...