[kron-oh-bahy-ol-uh-jee] 
| the science or study of the effect of time, esp. rhythms, on living systems. |
chronobiology chron·o·bi·ol·o·gy (krŏn'ō-bī-ŏl'ə-jē)
n.
The study of the effect of time on biological events, especially repetitive or cyclic phenomena in individuals.
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