Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb rarefy

3 senses of rarefy

Sense 1
rarefy -- (lessen the density or solidity of; "The bones are rarefied")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 2
rarefy, sublimate, subtilize -- (make more subtle or refined)
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 3
rarefy, attenuate -- (weaken the consistency of (a chemical substance))
       => weaken -- (lessen the strength of; "The fever weakened his body")