noun
1. perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts
• Syn: ↑frost-weed, ↑frostwort, ↑Helianthemum canadense, ↑Crocanthemum canadense
• Hypernyms: ↑helianthemum, ↑sunrose, ↑sun rose
2. tall perennial herb having clusters of white flowers; the eastern United States
• Syn: ↑Virginia crownbeard, ↑frost-weed, ↑Verbesina virginica
• Hypernyms: ↑crownbeard, ↑crown-beard, ↑crown beard
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\\ˈ ̷ ̷ˌ ̷ ̷\ noun : any of several plants upon which ice crystals form during the first frosts: as
b. : a salt-marsh fleabane (Pluchea camphorata)
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/frawst"weed', frost"-/, n.
a plant, Helianthemum canadense, of the rockrose family, native to eastern North America, having narrow leaves and a solitary yellow flower.
[1830-40, Amer.; FROST + WEED1; so called from the ice crystals which form on it during the first frosts]
Useful english dictionary. 2012.