Micraster

Definitions

  • Webster's Revised Unabridged Dictionary
    • n Micraster (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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Century Dictionary and Cyclopedia
    • n micraster A genus of fossil seaurchins or Echinoidea having a heart-shaped tumid test. It is very abundant in the Cretaceous rocks and occurs also in the early Tertiary.
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Etymology

Webster's Revised Unabridged Dictionary
NL., fr. Gr. mikro`s small + star