noun Ge·as·trum \jēˈastrəm\

Definition of Geastrum

  1. :  a genus (the type of the family Geastraceae) of basidiomycetous fungi having the outer peridium when dry splitting into starlike segments — compare earthstar

Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of geastrum

New Latin, from ge- + -astrum (from Greek astēr star) — more at star

Seen and Heard

What made you want to look up Geastrum? Please tell us where you read or heard it (including the quote, if possible).


to cast off or become cast off

Get Word of the Day daily email!