Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Circadian rhythm the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like. [2 definitions]
rhythm method a method of birth control that calls for abstaining from sexual intercourse during that time each month when the woman would most likely conceive.
rhythm section the instruments in a band or orchestra that provide the rhythmic beat, such as drums or a bass guitar.
rhythm-and-blues a kind of popular American music, developed mostly by blacks, that combines blues and jazz, is characterized by a strong beat, and was a precursor of rock-'n'-roll.