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Definitions

Century Dictionary and Cyclopedia

  1. 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.

Wiktionary

  1. n. paleontology Any of the extinct genus Micraster of infaunal echinoids.

GNU Webster's 1913

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

Etymologies

  1. From the genus name. (Wiktionary)

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  1. santonian

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