Dictionary.com

ultradian

[ uhl-trey-dee-uhn ]
/ ʌlˈtreɪ di ən /
Save This Word!

adjective
of or relating to a biorhythm having a period of less than 24 hours.
QUIZ
TEST YOUR MERIT ON THESE NEW WORDS IN 2021
The Dictionary added new words and definition to our vast collection, and we want to see how well-versed you are in the formally recognized new lingo. Take the quiz!
Question 1 of 8
What does JEDI stand for?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of ultradian

First recorded in 1960–65; ultra- + Latin di(ēs) “day” + -an
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Medical definitions for ultradian

ultradian
[ ŭl-trādē-ən ]

adj.
Relating to or exhibiting periodic physiological activity that occurs more than once every 24 hours.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
FEEDBACK