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ultradian: Meaning and Definition of

ul•tra•di•an

Pronunciation: (ul-trā'dē-un), [key]
— adj.
  1. of or pertaining to a biorhythm having a period of less than 24 hours.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
ultracritical ultrafast
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