资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.