Category:Rarefy

Rar"e*fy, v. t. [imp. & p. p. Rarefied; p. pr. & vb. n. Rarefying.] Etym: [f. raréfier; l. rarus rare + -ficare (in comp.) to make; cf. L. rarefacere. See -fy.]

Defn: to make rare, thin, porous, or less dense; to expand or enlarge Without adding any new portion of matter to; -- opposed to condense.

Rarefy Rar"e*fy, v. i.

Defn: to become less dense; to become thin and porous. "earth Rarefies to dew." Dryden.