Usually means: Rhythms shorter than twenty-four hours.
Definitions Related words Phrases Mentions History
We found 12 dictionaries that define the word ultradian:

General (8 matching dictionaries)
  1. ultradian: Oxford Learner's Dictionaries
  2. ultradian: American Heritage Dictionary of the English Language
  3. ultradian: Wiktionary
  4. ultradian: Infoplease Dictionary
  5. ultradian: Dictionary.com
  6. Ultradian: Wikipedia, the Free Encyclopedia
  7. ultradian: The Phrontistery - A Dictionary of Obscure Words
  8. ultradian: TheFreeDictionary.com

Medicine (4 matching dictionaries)
  1. ultradian: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. ultradian: Medical dictionary

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Definitions from Wiktionary (ultradian)

▸ adjective:  Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.

Similar:
sesquidiurnal, hemeral, ahemeral, periodic, quasiperiodic, polycyclical, semiperiodic, uniperiodic, multiperiodic, monoperiodic, more...

Opposite:
infradian, circadian, diurnal

Types:
circadian, infradian, more...

Phrases:
Ultradian rhythm, more...

▸ Words similar to ultradian

▸ Usage examples for ultradian

▸ Idioms related to ultradian

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▸ Popular nouns described by ultradian

▸ Words that often appear near ultradian

▸ Rhymes of ultradian

▸ Invented words related to ultradian

Similar:
sesquidiurnal, hemeral, ahemeral, periodic, quasiperiodic, polycyclical, semiperiodic, uniperiodic, multiperiodic, monoperiodic, more...

Opposite:
infradian, circadian, diurnal

Types:
circadian, infradian, more...

Phrases:
Ultradian rhythm, more...



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