trigger hair
noun
1- a hair-like structure which triggers a rapid movement when touched, in particular:触毛, 触须, 尤指：
1.1
- Zoology (in a coelenterate) a filament at the mouth of a nematocyst, triggering the emission of the stinging hair【动】（腔肠动物的）刺丝。
1.2
- Botany a bristle on the leaf of a Venus flytrap, triggering the closure of the leaf around an insect【植】（捕蝇草叶子上的）刺毛。