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verb Rarefy v. t. (past & past part. rarefied; pres. part. rarefying) To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; opposed to condense.
Rarefy v. i. To become less dense; to become thin and porous. "Earth rarefies to dew."
Collaborative International Dictionary of English 0.48
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