Capsaicin Definition
 kăp-sāĭ-sĭn 
    noun
  
 An alkaloid, C18H27NO3, with a burning taste, extracted from capsicum.
 Webster's New World 
(organic chemistry) A chemical compound found in chilli peppers, which is responsible for their pungent flavor.
 Wiktionary 
Origin of Capsaicin
Alteration (perhaps influenced by Latin capsa box) of earlier capsicin capsic(um) –in
From American Heritage Dictionary of the English Language, 5th Edition
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