Any of various weeds or plants of little value or use, particularly those with chaffy seed heads.
Compound from 'chaff' (worthless) and 'weed' (unwanted plant). This folk-etymological term combines two words for things considered undesirable or worthless, creating a double emphasis on uselessness in agricultural contexts.
Calling something 'chaffweed' was medieval farmers' way of saying 'completely useless plant'—imagine stacking two insults together, which is exactly what happens when you combine 'chaff' and 'weed,' the two things no farmer wanted in their fields.
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