biorhythms=بيورهيثمس

biorhythms=بيورهيثمس

ONLINE ETYMOLOGY DICTIONARY:

biorhythm (n.)

also bio-rhythm, 1960, from bio- + rhythm. Related: Biorhythmic.

bio-

word-forming element, from Gk. bio-, comb. form of bios "one's life, course or way of living, lifetime" (as opposed to zoe "animal life, organic life"), from PIE root *gweie- "to live" (cf. Skt. jivah "alive, living;" O.E. cwic "alive;" L. vivus "living, alive," vita "life;" M.Pers. zhiwak "alive;" O.C.S. zivo "to live;" Lith. gyvas "living, alive;" O.Ir. bethu "life," bith "age;" Welsh byd "world"). Equivalent of L. vita. The correct usage is that in biography, but in modern science it has been extended to mean "organic life."

rhythm (n.)

1550s, from L. rhythmus "movement in time," from Gk. rhythmos "measured flow or movement, rhythm," related to rhein "to flow," from PIE root *sreu- "to flow" (see rheum). In Medieval Latin, rithmus was used for accentual, as opposed to quantitative, verse, and accentual verse was usually rhymed. Rhythm method of birth control attested from 1936. Rhythm and blues, U.S. music style, is from 1949 (first in "Billboard").