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word-forming element, from Greek 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. Sanskrit jivah "alive, living;" Old English cwic "alive;" Latin vivus "living, alive," vita "life;" Middle Persian zhiwak "alive;" Old Church Slavonic zivo "to live;" Lithuanian gyvas "living, alive;" Old Irish bethu "life," bith "age;" Welsh byd "world"). Equivalent of Latin vita. The correct usage is that in biography, but in modern science it has been extended to mean "organic life."
bio- or bi-
Life; living organism: biology.
Biology; biological: biophysics.
A biography, esp a brief one in a yearbook, theater program, etc: By now Jenny had read my bio in the program ( first form 1950s+, second 1940s+)