Dictionary entry

Cyatholith

Webster's Dictionary 1913

Cy‐ath″olith (s?–?th″?–l?th), n. [Gr. κύαθοσ a cup + -lith.] (Biol.) A kind of coccolith, which in shape resembles a minute cup widened at the top, and varies in size from ⅟₆₀₀₀ to ⅟₈₀₀₀ of an inch.