Help Wordnik hunt for a million missing words by backing our Kickstarter!


from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One of the Blastoidea.

from the GNU version of the Collaborative International Dictionary of English

  • n. One of the Blastoidea.

from The Century Dictionary and Cyclopedia

  • Having the characters of or pertaining to the Blastoidea: as, a blastoid crinoid.
  • n. An echinoderm of the group Blastoidea.


Sorry, no etymologies found.


  • Later Paleozoic seas were dominated by crinoid and blastoid echinoderms, articulate brachiopods, graptolites, and tabulate and rugose corals.


  • The Permian extinction, 244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites.


  • The blastoid is stemmed and armless, and its globular "head" or

    The Elements of Geology


Log in or sign up to get involved in the conversation. It's quick and easy.