purple onion purple oat • purple orchis · · · Info · Definitions · Synonyms · Characters · · purple onion · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) flat mild onion having purplish tunics; used as garnish on hamburgers and salads. Synonyms: purple onion, red onion. · · Noun Definition 1 Synonyms · · · red onion · · Synonym 1 Characters · · space U+0020 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075