Definition of startle reflex in English:

startle reflex

noun

  • An involuntary reaction to a sudden stimulus, especially a loud noise, often involving contraction of groups of muscles of the limbs and neck; a similar reaction shown by an animal.

Origin

Early 20th century; earliest use found in Military Surgeon. From startle + reflex.

Pronunciation

startle reflex

/ˈstɑːtl ˌriːflɛks/