rhythmos
Could not find rhythmis in Logeion dictionaries.
rhythmis masculine dative plural, masculine ablative plural of rhythmos
rhythmos or -us, i, m., = ῥυθμός,
- symmetry, harmony, rhythm in music or speech, Mart. Cap. 9, § 967 sqq.; Varr. ap. Diom. p. 512 P.; Quint. 9, 4, 45 sq.; 51 sq.; 78; 109 (Cicero constantly has numerus instead of this word, which he writes only as Greek, Or. 20, 67; 51, 170).