Definition of whiteweed in US English:

whiteweed

noun

North American
  • Any of various plants, typically white-flowered species of the family Asteraceae (Compositae), which are considered to be weeds, especially of agricultural land; especially the ox-eye daisy, Leucanthemum vulgare.

Origin

Mid 17th century; earliest use found in Henry Best (c1592–1645), landowner and farmer. From white + weed.

Pronunciation

whiteweed

/ˈwʌɪtwiːd/