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frostweed

[frawst-weed, frost-]
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noun
  1. a plant, Helianthemum canadense, of the rockrose family, native to eastern North America, having narrow leaves and a solitary yellow flower.
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Origin of frostweed

1830–40, Americanism; frost + weed1; so called from the ice crystals which form on it during the first frosts
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018