RAREFY

rarefy. Rarefy, v. to make or become thin, expand, dilate

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Rar″e‐fy (răr″ē̍‐fī; 277), v. t. [imp. & p. p. Rarefied (–fīd); p. pr. & vb. n. Rarefying (–fī′ĭng).] [[F. raréfier; L. rarus rare + -ficare (in comp.) to make; cf. L. rarefacere. See -fy.]] To make rare, thin, porous, or less dense; to expand or enlarge without adding any new portion of matter to; — opposed to condense.