| Noun | 1. frost-weed - 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 frostsCrocanthemum canadense, frostweed, frostwort, Helianthemum canadensehelianthemum, sun rose, sunrose - any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | | 2. frost-weed - tall perennial herb having clusters of white flowers; the eastern United StatesVerbesina virginica, Virginia crownbeard, frostweedcrown beard, crownbeard, crown-beard - any plant of the genus Verbesina having clustered white or yellow flower heads |