/ Thesaurus / H Synonyms of heracleum Find synonyms for: Noun1. Heracleum, genus Heracleum, rosid dicot genususage: widely distributed genus of plants with usually thick rootstocks and large umbels of white flowersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language