rar·e·fy also rar·i·fy (rârə-fī′)
v. rar·e·fied, rar·e·fy·ing, rar·e·fies also rar·i·fied or rar·i·fy·ing or rar·i·fies
1. To make thin or less dense, as air.
2. To purify or refine: "The [medieval] Italians ... rarefy the image of the lady, treating her as a quasi-celestial figure" (Marcia L. Colish).
To become thin or less dense.
[Middle English rarefien, from Old French rarefier, from Medieval Latin rārificāre, alteration of Latin rārēfacere : rārus, rare + facere, to make; see dhē- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
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