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trigger hair

Line breaks: trig|ger hair

Definition of trigger hair in English:

noun

1 Zoology (In a coelenterate) a filament at the mouth of a nematocyst which triggers the emission of the stinging hair when touched.
Example sentences
  • At the narrow outer edge of the cnidocyte is a short trigger hair.
  • When the trigger hair on the outside of a nematocyte is touched, a coiled thread tube inside the enclosed nematocyst is released.
2 Botany A bristle on the leaf of a Venus flytrap which triggers the closure of the leaf around an insect.
Example sentences
  • The first phase of the leaf closure begins when a trigger hair is disturbed.
  • The flytrap features a set of inch-long, heart-shaped capture leaves, each fringed with trigger hairs and bisected by a deep fold.
  • Darwin's investigation into the biology of the Venus flytrap involved testing the sensitivity of trigger hairs.

Definition of trigger hair in:

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