WordReference Random House Unabridged Dictionary of American English © 2020
cap•sa•i•cin  (kap sāə sin),USA pronunciation n. 
  1. a colorless, crystalline, bitter compound, C18H27NO3, present in capsicum.
  • Latin: box) for caps- and -in2 for -ine2
  • 1885–90; earlier capsicine, equivalent. to capsic(um) + -ine2; refashioned with capsa- (

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