The Collaborative International Dictionary
Discolith
Discolith \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.
Wiktionary
discolith
n. (context biology English) A kind of coccolith with an oval discoidal body, a thick strongly refracting rim and a thinner central portion.