• WordNet 3.6
    • n 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 Urticaceae
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Century Dictionary and Cyclopedia
    • n humulus A genus of dicotyledonous monochlamydeous plants, of the natural order Urticaceæ and tribe Cannabineæ. They have diœcious flowers, the male in loose axillary panicles, with 5 sepals and 5 erect stamens, the female in short axillary and solitary spikes or catkins, with foliaceous imbricated bracts, each 2-flowered, in fruit forming a sort of membranaceous strobile. The plants are twining rough perennials, with mostly opposite, heart-shaped, and palmately 3- to 7-lobed leaves. Only two species are known: H. lupulus, the common hop, widely cultivated, and another, a native of China and Japan. One species, H. palæolupulus, has been found in a fossil state in the Pliocene formation at Meximieux in the department of Ain, France. See cut under hop.
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In news:

Soon to join the safe-and-effective list could be hops, or Humulus lupulus.