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Webster 1913 Edition

Noun.

(Bot.)

A curious fungus of the genus

Geaster

, in which the outer coating splits into the shape of a star, and the inner one forms a ball containing the dustlike spores.

earthstar ‎(plural earthstars)

A type of puffball mushroom, of genus Geastrum, whose surface splits open in a star-shaped form.

a type of puffball