Word of the day

The word for today is…

ultradian (adj) – Relating to or exhibiting periodic physiological activity that occurs more than once every 24 hours.

Source : The Free Dictionary

Etymology : The English adjectives ultradian and circadian are close contemporaries—1961 for ultradian, 1959 for circadian. Both adjectives refer to biological or physiological cycles, ultradian meaning “recurring with a period shorter than a day,” and circadian “recurring with a period of approximately 24 hours.” Both adjectives have similar formations: the Latin prefix ultra- meaning “beyond, on the far side of” and circa meaning “around, about.” The element -dian is formed from the Latin noun diēs “day” and the English adjective suffix -an, from Latin -ānus.


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