| Noun | 1. | genus Humulus - hops: hardy perennial vines of Europe, North America and central and eastern Asia producing a latex sap; in some classifications included in the family Urticaceaedicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination Cannabidaceae, family Cannabidaceae, hemp family - 2 genera of erect or twining wind-pollinated herbs: genera Cannabis and Humulus; term not used in all classifications; in some the genus Cannabis is placed in the family Moraceae and the genus Humulus in the family Urticaceae hops, hop - twining perennials having cordate leaves and flowers arranged in conelike spikes; the dried flowers of this plant are used in brewing to add the characteristic bitter taste to beer | |