genus Heracleum ge·nus·he·racleum uncommon noun 1. widely distributed genus of plants with usually thick rootstocks and large umbels of white flowers SynonymsHeracleumgenus Heracleum Related words Broader terms rosid dicot genus Parts Umbelliferae Part of cow parsnip WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
