frost flower
noun
1
a
: a small bulbous herb (Milla biflora) of Mexico and the southwestern U.S.
also
: its star-shaped flower
called also floating star
b
: a plant of the genus Aster
c
2
: an ice crystal resembling a flower
especially
: one formed on the ground or in the subsoil
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Merriam-Webster unabridged
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