Definition of frostweed 

: any of several plants upon which ice crystals form during the first frosts: such as

a : an American plant of the genus Helianthemum — see frostwort

b : a salt-marsh fleabane (Pluchea camphorata)

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First Known Use of frostweed

1817, in the meaning defined above

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The first known use of frostweed was in 1817

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playful or foolish behavior

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