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Meaning of giant hogweed

gi'ant hog'weed

Pronunciation: [key]
  1. a tall plant, Heracleum mantegazzianum, of the parsley family, native to Russia and now naturalized in the U.S., having very large leaves and broad, white flower heads somewhat resembling Queen Anne's lace: can cause an allergic rash when touched by susceptible persons.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.