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Meaning of incapacitant

in•ca•pac•i•tant

Pronunciation: (in"ku-pas'i-tunt), [key]
— n.
  1. something, as a chemical spray, that incapacitates an individual: to use incapacitants for riot control.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.