Definition of rarefy in English:

rarefy

Line breaks: rar¦efy
Pronunciation: /ˈrɛːrɪfʌɪ/

Entry from British & World English dictionary

(also rarify)

verb (rarefies, rarefying, rarefied)

Make or become less dense or solid: [with object]: air rarefies and degrounds the physical body [no object]: as the shell continues to expand and rarefy, astronomers may eventually be able to see characteristic gamma rays from the radioactivity within

Origin

late Middle English: from Old French rarefier, or medieval Latin rareficare, based on Latin rarus 'rare' + facere 'make'.

Derivatives

rarefication

Pronunciation: /-fɪˈkeɪʃ(ə)n/
noun

rarefactive

Pronunciation: /-ˈfaktɪv/
adjective

Definition of rarefy in:

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Word of the day apposite
Pronunciation: ˈapəzit
adjective
apt in the circumstances or relation to something