Micraster

Micraster

Mi*cras"ter\, n. [NL., fr. Gr. mikro`s small + ? star.] (Paleon.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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