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chronic
chronic daily headaches
chronic fatigue syndrome
chronic pain syndrome
chronic wasting disease
chronicle
Chronicles
chrono-
chronobiology
chronogram
chronograph
chronol.
chronological
chronological age
chronology
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chronobiology
chron·o·bi·ol·o·gy [ krònnə bī ólləjee ]


noun 
Definition:
 
study of natural world's recurring events: the study of recurring cycles of events in the natural world

chron·o·bi·o·log·ic [ krònnə bī ə lójjik ] adjective
chron·o·bi·ol·o·gist [ krònnə bī ólləjist ] noun
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