sternutatory

Adjective
  1. Tending to cause sneezing (synset 303019437)
  2. Causing sneezing (synset 300325967)
    "pepper is a sternutatory substance"
Noun
  1. A chemical substance that causes sneezing and coughing and crying (synset 115082125)
    "police used a sternutatory to subdue the mob"

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