the glandular hairs of the hop, Humulus lupulus, formerly used in medicine as a sedative.

1820–30; < Neo-Latin lupul(us) (diminutive of Latin lupus the hop plant; see -ule) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lupulin (ˈluːpjʊlɪn)
a resinous powder extracted from the female flowers of the hop plant and used as a sedative
[C19: from New Latin lupulus, diminutive of lupus the hop plant]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The bracteoles and seeds bear numerous yellowish, glandular bodies called lupulin.
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