reticular activating system reticular • reticular formation · · · Info · Definitions · Synonyms · Characters · · reticular activating system · · Text Common · · Latin · · Scripts 27 · · Length 10 · · Syllables Definitions · · · (noun) the network in the reticular formation that serves an alerting or arousal function. Synonyms: reticular activating system, RAS. · · Noun Definition 1 Synonyms · · · ras · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075 v latin small letter v U+0076 y latin small letter y U+0079