nychthemeron

noun
nych·them·er·on
variants: or less commonly nycthemeron \⸗ˈ⸗məˌrän \
plural nychthemera\-m(ə)rə \ or nychthemerons

Definition of nychthemeron 

: a full period of a night and a day

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History and Etymology for nychthemeron

Greek nychthēmeron, from nykt-, nyx night + -hēmeron (from hēmera day)

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