Webster's 1913 Dictionary
HOGWEED
HOGWEED Hog "weed `, n. (Bot. )(a ) A common weed (Ambrosia artemisiæge ). See Ambrosia, 3. (b ) In England, the Heracleum Sphondylium.
New American Oxford Dictionary
hogweed
hog weed |ˈhôgˌwēd, ˈhäg -ˈhɔɡˌwid ˈhɑɡˌwid | ▶noun a large, coarse, white-flowered weed of the parsley family, native to north temperate regions and formerly used as forage for pigs. [Genus Heracleum, family Umbelliferae: several species, in particular the common European H. sphondylium and the introduced giant hogweed (H. mantegazzianum ).]
Oxford Dictionary
hogweed
hog |weed |ˈhɒgwiːd | ▶noun [ mass noun ] a large white-flowered weed of the parsley family, native to north temperate regions and formerly used as forage for pigs. ●Genus Heracleum, family Umbelliferae: several species, in particular the common European H. sphondylium and the introduced giant hogweed (H. mantegazzianum ).