variants:
or less commonly rarify
rarefied; rarefying
Definition of rarefy
1
: to make rare, thin, porous, or less dense : to expand without the addition of matter
2
: to make more spiritual, refined, or abstruse
: to become less dense
Keep scrolling for more
Keep scrolling for more
Test Your Vocabulary
Which Word Does Not Belong?
-
- Which of these words does not mean "nonsense"?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share rarefy
Time Traveler for rarefy
The first known use of rarefy was in the 14th century
See more words from the same century