poly·​pha·​sic | \ ˌpä-lē-ˈfā-zik How to pronounce polyphasic (audio) \

Definition of polyphasic

: consisting of two or more phases

Examples of polyphasic in a Sentence

Recent Examples on the Web Some literature and research suggests that humans are naturally polyphasic sleepers. Jamie Ducharme, Time, "People Are Sleeping in 20-Minute Bursts To Boost Productivity. But Is It Safe?," 30 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'polyphasic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of polyphasic

1922, in the meaning defined above

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Time Traveler for polyphasic

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The first known use of polyphasic was in 1922

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Cite this Entry

“Polyphasic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polyphasic. Accessed 1 Oct. 2020.

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More Definitions for polyphasic


poly·​pha·​sic | \ -ˈfā-zik How to pronounce polyphasic (audio) \

Medical Definition of polyphasic

1 : of, relating to, or having more than one phase polyphasic evoked potentials — compare diphasic sense b, monophasic sense 1
2 : having several periods of activity interrupted by intervening periods of rest in each 24 hours an infant is essentially polyphasic

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