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Webster's Dictionary 1828 - Online Edition

Webster's Dictionary 1828

Americal Dictionary of the English Language

American Dictionary
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Rarefy

RAR'EFY, verb transitive [Latin rarefacio; rarus, rare, and facio, to make.]

To make thin and porous or less dense; to expand or enlarge a body without adding to it any new portion of its own matter; opposed to condense.

RAR'EFY, verb intransitive To become thin and porous.