Rarefy Definition

rerəfī
rarefied, rarefies, rarefying, rarified, rarifies, rarifying
verb
rarefied, rarefies, rarifies
To make or become more refined, subtle, or lofty.
A rarefied sense of humor.
Webster's New World
To purify or refine.
American Heritage
To make or become thin, or less dense.
The rarefied mountain air.
Webster's New World

To expand or enlarge without adding any new portion of matter to.

Wiktionary
Synonyms:

Origin of Rarefy

  • Middle English rarefien from Old French rarefier from Medieval Latin rārificāre alteration of Latin rārēfacere rārus rare facere to make dhē- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • rare +"Ž -fy

    From Wiktionary

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