Etymology
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capsaicin

active component of chili peppers, 1851, from capsicum, from which it is extracted, + chemical suffixes. Capsicine (1816) was an earlier name of an impure form of it.

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Definitions of capsaicin

capsaicin (n.)
colorless pungent crystalline compound derived from capsicum; source of the hotness of hot peppers of the genus Capsicum such as chili and cayenne and jalapeno;
From wordnet.princeton.edu