1.Definition: any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma

Related Noun(s):ambrosia, bitterweed

Category: Plants

2.Definition: widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity

Related Noun(s):benweed, ragwort, senecio jacobaea, tansy ragwort

Category: Plants