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Webster 1913 Edition
Discolith
Dis′co-lith
,Noun.
[Gr. [GREEK] 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.