giant ragweed

noun

See under ragweed.

Words nearby giant ragweed

giant peacock moth, giant petrel, giant planet, giant powder, giant puffball, giant ragweed, giant redwood, giant reed, giant scallop, giant schnauzer, giant sequoia

Definition for giant ragweed (2 of 2)

ragweed
[ rag-weed ]
/ ˈrægˌwid /

noun

any of the composite plants of the genus Ambrosia, the airborne pollen of which is the most prevalent cause of autumnal hay fever, as the common North American species, A. trifida (great ragweed or giant ragweed) and A. artemisiifolia.

Origin of ragweed

1650–60; rag1 + weed1, so called from its ragged appearance

British Dictionary definitions for giant ragweed

ragweed
/ (ˈræɡˌwiːd) /

noun

any plant of the chiefly North American genus Ambrosia, such as A. artemisiifolia (common ragweed): family Asteraceae (composites). Their green tassel-like flowers produce large amounts of pollen, which causes hay fever Also called: ambrosia

Medical definitions for giant ragweed

ragweed
[ răg′wēd′ ]

n.

Any of various weeds of the genus Ambrosia having small greenish unisexual flower heads and producing abundant pollen that is one of the chief causes of hay fever.