Usually means: Twenty-four hour day-night cycle.
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We found 8 dictionaries that define the word nychthemeron:

General (8 matching dictionaries)
  1. nychthemeron: Merriam-Webster
  2. nychthemeron: Collins English Dictionary
  3. nychthemeron: Wordnik
  4. nychthemeron: Wiktionary
  5. Nychthemeron: Wikipedia, the Free Encyclopedia
  6. nychthemeron: Grandiloquent Dictionary
  7. nychthemeron: The Phrontistery - A Dictionary of Obscure Words
  8. Nychthemeron: World Wide Words

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Definitions from Wiktionary (nychthemeron)

▸ noun:  A period of one day and one night, a date: in the West, a period of 24 consecutive hours.

Similar:
nycthemere, tonight, hexahemeron, night, sevennight, nighttime, calendar day, hexaemeron, sennight, equinox, more...

Opposite:
hemeralopia, diurnal cycle, daytime cycle

Types:
day, night, more...

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Similar:
nycthemere, tonight, hexahemeron, night, sevennight, nighttime, calendar day, hexaemeron, sennight, equinox, more...

Opposite:
hemeralopia, diurnal cycle, daytime cycle

Types:
day, night, more...



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