ragweed(redirected from Ambrosia (genus))
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1. Any of various weeds of the genus Ambrosia of the composite family, having small, greenish, unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.
2. Chiefly British Ragwort.
ragweedA plant of the family Compositae, the pollen from which is highly allergenic and the most common cause of allergic rhinitis.
Bronchial provocation testing, in which pollen is inhaled through a dosimeter.
Avoidance of pollens by staying indoors; use of cromolyn, antihistamines, sympathomimetics, theophylline and corticosteroids.