Ultradian

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This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

The American Heritage® Dictionary of the English Language, 4th Edition
  • adj. Relating to or exhibiting periodic physiological activity that occurs more than once every 24 hours.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • adj. Cyclical with a periodicity significantly shorter than 24 hours, that is, more frequent than circadian.
  • Word Usage
    "In fact, I, along with my twenty-four year old son, experience what is known as ultradian rapid-cycling."
    Cross Reference
    infradian   
    Same Context
    Words that are found in similar contexts
    five-four    semilunar    tick-tick    conga    parkinsonian