What is HOP?

The fruit of this plant contains a yellow, bitter powder named lupulin, of mixed constitution including a resin, a waxy body, and extractive matters, and when distilled with water it yields valerianic acid and a volatile oil. The real bitter principle is said to form about from 8 to 12 per cent, of the lupulin powder of which the hop fruit contains about 10 per cent., and includes an acid named humulon.

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Definition of  HOP