Am″phi‐disc (�), n. [Gr. αμφἴ + δίσκοσ a round plate.] (Zoöl.) A peculiar small siliceous spicule having a denticulated wheel at each end; — found in freshwater sponges.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.