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Cyatholith
Cyatholith Cy*ath"olith (s?-?th"?-l?th), n. [Gr. ky`aqos a cup
+ -lith.] (Biol.)
A kind of coccolith, which in shape resembles a minute cup
widened at the top, and varies in size from 1/6000 to 1/8000
of an inch.
Meaning of Cyatholith from wikipedia