• WordNet 3.6
    • n frostweed tall perennial herb having clusters of white flowers; the eastern United States
    • n frostweed 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
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Webster's Revised Unabridged Dictionary
    • n Frostweed (Bot) An American species of rockrose (Helianthemum Canadense), sometimes used in medicine as an astringent or aromatic tonic.☞ It has large yellow flowers which are often sterile, and later it has abundant but inconspicuous flowers which bear seed. It is so called because, late in autumn, crystals of ice shoot from the cracked bark at the root; -- called also frostwort.
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Century Dictionary and Cyclopedia
    • n frostweed A common name in the United States for the Helianthemum Canadense, or rock-rose: so called from the crystals of ice which shoot from the bursting bark toward the base of the stem during freezing weather in autumn. It has been used in medicine as a bitter and an astringent. Also called frostwort.
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In news:

Usually dozens of Monarchs break from their flight in the late afternoons and evenings to fuel up on abundant Frostweed or Goldenrod.