Origin of ultradian
"ultradian." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/ultradian>.
ultradian. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/ultradian
(comparative more ultradian, superlative most ultradian)
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