rhythˈmetic, -ical,a. [f.Gr. ῥυθµητικός, f. ῥυθµεῖν: see -ic, -ical.] Rhythmical. 1603Holland Plutarch's Mor. 1259 The Rhythmetique matter [ἡ ῥυθµικὴ πραγµατεία].1842Mrs. Browning Grk. Chr. Poets iii, An unaccustomed rhythmetic pomp.1844― Lett. R. H. Horne (1877) II. 8 A rhythmetical writer.