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  1. Oxford American Dictionary

    trigger hair

    • IPA[ˈtriɡər her]
    • n.
      (in a coelenterate) a filament at the mouth of a nematocyst, triggering the emission of the stinging hair.；a bristle on the leaf of a Venus flytrap, triggering the closure of the leaf around an insect.

    • noun: trigger hair, plural noun: trigger hairs