Rheidae rheic • Rheiformes · · · Info · Definitions · Characters · · Rheidae · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a family of birds coextensive with the order Rheiformes. Synonyms: family Rheidae. · · Noun Definition 1 Characters · · R latin capital letter r U+0052 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069