Trifolium agrarium

Hop Hop, n. [OE. hoppe; akin to D. hop, hoppe, OHG. hopfo, G. hopfen; cf. LL. hupa, W. hopez, Armor. houpez, and Icel. humall, SW. & Dan. humle.] 1. (Bot.) A climbing plant ({Humulus Lupulus}), having a long, twining, annual stalk. It is cultivated for its fruit (hops). [1913 Webster]

2. The catkin or strobilaceous fruit of the hop, much used in brewing to give a bitter taste. [1913 Webster]

3. The fruit of the dog-rose. See {Hip}. [1913 Webster]

{Hop back}. (Brewing) See under 1st {Back}.

{Hop clover} (Bot.), a species of yellow clover having heads like hops in miniature ({Trifolium agrarium}, and {Trifolium procumbens}).

{Hop flea} (Zo["o]l.), a small flea beetle ({Haltica concinna}), very injurious to hops.

{Hop fly} (Zo["o]l.), an aphid ({Phorodon humuli}), very injurious to hop vines.

{Hop froth fly} (Zo["o]l.), an hemipterous insect ({Aphrophora interrupta}), allied to the cockoo spits. It often does great damage to hop vines.

{Hop hornbeam} (Bot.), an American tree of the genus {Ostrya} ({Ostrya Virginica}) the American ironwood; also, a European species ({Ostrya vulgaris}).

{Hop moth} (Zo["o]l.), a moth ({Hypena humuli}), which in the larval state is very injurious to hop vines.

{Hop picker}, one who picks hops.

{Hop pole}, a pole used to support hop vines.

{Hop tree} (Bot.), a small American tree ({Ptelia trifoliata}), having broad, flattened fruit in large clusters, sometimes used as a substitute for hops.

{Hop vine} (Bot.), the climbing vine or stalk of the hop. [1913 Webster]