from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of the extinct genus Micraster of infaunal echinoids.

from the GNU version of the Collaborative International Dictionary of English

  • n. A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.

from The Century Dictionary and Cyclopedia

  • n. 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.


From the genus name. (Wiktionary)


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