- to make rare or rarer; make less dense: to rarefy a gas.
- to make more refined, spiritual, or exalted.
- to become rare or less dense; become thinned: Moisture rarefies when heated.
Origin of rarefy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rarefy
But if warm dry winds blow upon the clouds, they rarefy the vapour to a greater degree, and temporarily disperse the clouds.The Reason Why
The rarefy of the atmosphere continued to affect the wood-work of the wagons, and the wheels were incessantly falling to pieces.The Adventures of Captain Bonneville
But extend this vapour, rarefy it; from so narrow a room as our natural bodies, to any politic body, to a state.Devotions Upon Emergent Occasions
The air consequently was damp and gross, for want of stronger rays to open and rarefy it.The Boys' and Girls' Plutarch
But as such means are not at disposal, it becomes necessary to place the terminal in the bulb and rarefy the air in the same.The inventions, researches and writings of Nikola Tesla
Thomas Commerford Martin
- to make or become rarer or less dense; thin out
C14: from Old French raréfier, from Latin rārēfacere, from rārus rare 1 + facere to make
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for rarefy
Online Etymology Dictionary, © 2010 Douglas Harper