ambrosia : Idioms & Phrases
ambrosia artemisiifolia
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noun annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentally
common ragweed.
WordNet
ambrosia psilostachya
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noun coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
western ragweed; perennial ragweed.
WordNet
ambrosia trifida
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noun a coarse annual with some leaves deeply and palmately three-cleft or five-cleft
great ragweed.
WordNet
genus ambrosia
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noun comprising the ragweeds; in some classification considered the type genus of a separate family Ambrosiaceae