Prototheria protothere • prototherian · · · Info · Definitions · Characters · · Prototheria · · Text Latin · · Script 11 · · Length Definitions · · · (noun) echidnas; platypus. Synonyms: subclass Prototheria. · · Noun Definition 1 Characters · · P latin capital letter p U+0050 a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074