ultradian - WordReference.com Dictionary of English

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ultradian

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Concise Oxford English Dictionary © 2008 Oxford University Press:
ultradian /ʌlˈtreɪdɪən/

▶adjective Physiology recurring more than once a day (but less than once an hour). Compare with infradian.

– origin 1960s: from ultra- ‘beyond’ on the pattern of circadian.

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