‖Mi‐cras″ter (?), n. [NL., fr. Gr. μικρόσ small + � star.] (Paleon.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; — from the starlike disposal of the ambulacral furrows.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.