1. a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs; [syn: startle reflex, Moro reflex]
WordNet (r) 3.0 (2006):
startle reflex
n 1: a normal reflex of young infants; a sudden loud noise
causes the child to stretch out the arms and flex the legs
[syn: startle reflex, Moro reflex]