ragweed

the word 'ragweed' is a compound formed from two old english elements, both referring to undesirable plants. 'rag' evolved from a term for a rough scrap of cloth to denote something worthless or coarse, aptly describing the plant's common and unrefined nature. 'weed' has consistently meant an unwanted wild plant. when combined in the early 19th century, the term logically created a name for a prevalent, bothersome plant, a meaning perfectly aligned with its modern identity as a notorious source of allergenic pollen. its formation follows the straightforward english pattern of combining two descriptive nouns to label a natural object.

Structure: rag (coarse plant) + weed (wild plant) rag (from middle english 'ragge', old english 'ragg', of scandinavian origin, meaning a piece of coarse cloth or a worthless thing; used here to denote a coarse, common plant). weed (from old english 'wēod', meaning a herb, grass, or wild plant).