startle reflex startle reaction • startle response · · · Info · Definitions · Synonyms · Characters · · startle reflex · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) a normal reflex of young infants; a sudden loud noise causes the child to stretch out the arms and flex the legs. Synonyms: startle reflex, Moro reflex. · · Noun Definition 1 Synonyms · · · moro reflex · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 x latin small letter x U+0078