alder fly alderfly • alder flycatcher · · · Info · Definitions · Synonyms · Characters · · alder fly · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) dark-colored insect having predaceous aquatic larvae. Synonyms: alderfly, alder fly, Sialis lutaria. · · Noun Definition 1 Synonyms · · · alderfly · · Synonym 1 sialis lutaria · · Synonym 2 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 f latin small letter f U+0066 l latin small letter l U+006C r latin small letter r U+0072 y latin small letter y U+0079