Sialidae sialidae • sialidan · · · Info · Definitions · Characters · · Sialidae · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) an arthropod family including: alderflies. Synonyms: family Sialidae. · · Noun Definition 1 Characters · · S latin capital letter s U+0053 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C