Lycopus ly·co·pus uncommon noun 1. small genus of herbs of the mint family Synonymsgenus Lycopus Related words Word family Lycopus americanusLycopus europaeusLycopus virginicus Broader terms asterid dicot genus Parts Labiatae Part of bugleweedwater horehoundgipsywort WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.