red algae red alert • redamage · · · Info · Definitions · Characters · · red algae · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan. Synonyms: red algae. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C r latin small letter r U+0072