Hogweed \Hog"weed`\, n. (Bot.) (a) A common weed ({Ambrosia artemisi[ae]ge}). See {Ambrosia}, 3. (b) In England, the {Heracleum Sphondylium}.
Heracleum sphondylium n : tall coarse plant having thick stems and cluster of white to purple flowers [syn: {cow parsnip}, {hogweed}]