Definition of ironweed in English:

ironweed

noun ˈʌɪənwiːd

Any of various plants growing as weeds of cultivated land and typically having tough or wiry stems; specifically (a) black or common knapweed, Centaurea nigra (now rare); (b) North American any of several species of the genus Vernonia (family Asteraceae (Compositae)).

Origin

Early 19th century; earliest use found in Thomas Batchelor (1775–1838), farmer and writer on language. From iron + weed.

Definition of ironweed in US English:

ironweed

nounˈʌɪənwiːd

Any of various plants growing as weeds of cultivated land and typically having tough or wiry stems; specifically (a) black or common knapweed, Centaurea nigra (now rare); (b) North American any of several species of the genus Vernonia (family Asteraceae (Compositae)).

Origin

Early 19th century; earliest use found in Thomas Batchelor (1775–1838), farmer and writer on language. From iron + weed.

单词	ironweed
释义	Definition of ironweed in English: ironweed noun ˈʌɪənwiːd Any of various plants growing as weeds of cultivated land and typically having tough or wiry stems; specifically (a) black or common knapweed, Centaurea nigra (now rare); (b) North American any of several species of the genus Vernonia (family Asteraceae (Compositae)). Origin Early 19th century; earliest use found in Thomas Batchelor (1775–1838), farmer and writer on language. From iron + weed. Definition of ironweed in US English: ironweed nounˈʌɪənwiːd Any of various plants growing as weeds of cultivated land and typically having tough or wiry stems; specifically (a) black or common knapweed, Centaurea nigra (now rare); (b) North American any of several species of the genus Vernonia (family Asteraceae (Compositae)). Origin Early 19th century; earliest use found in Thomas Batchelor (1775–1838), farmer and writer on language. From iron + weed.
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