Dis"co*lith\, n. [Gr. ? a round plate + -lith.] (Biol.) One of a species of coccoliths, having an oval discoidal body, with a thick strongly refracting rim, and a thinner central portion. One of them measures about 1/50000 of an inch in its longest diameter.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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