n 1  :  a twining vine (Humulus lupulus) of the mulberry family with 3-lobed or 5-lobed leaves and inconspicuous flowers of which the pistillate ones are in glandular cone-shaped catkins  2  hops  pl  :  the ripe dried pistillate catkins of a hop used esp. to impart a bitter flavor to malt liquors and also in medicine as a tonic .
abbr high oxygen pressure .
 
 
 
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