rhythmyoudaoicibaDictYouDict[rhythm 词源字典]
rhythm: [16] Rhythm goes back ultimately to Greek rhuthmós. This originally meant ‘recurring motion’, and was related to the verb rhein ‘flow’ (source of English catarrh and diarrhoea). It was subsequently applied to ‘recurrent accents in verse’, in which sense it passed into English via Latin rhythmus. (Later Old French alteration of the word led to English rhyme.)
=> catarrh, diarrhoea, rheumatic, rhyme[rhythm etymology, rhythm origin, 英语词源]
rhythm (n.)youdaoicibaDictYouDict
1550s, "rhymed verse, metrical movement," from Latin rhythmus "movement in time," from Greek rhythmos "measured flow or movement, rhythm; proportion, symmetry; arrangement, order; form, shape, wise, manner; soul, disposition," related to rhein "to flow," from PIE root *sreu- "to flow" (see rheum). Rhythm method of birth control attested from 1936. Rhythm and blues, U.S. music style, is from 1949 (first in "Billboard").