arrhenatherum arrhenal • Arrhenatherum · · · Info · Definitions · Characters · · arrhenatherum · · Text Latin · · Script 13 · · Length 5 · · Syllables Definitions · · · (noun) oat grass. Synonyms: Arrhenatherum, genus Arrhenatherum. · · Noun Definition 1 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075