rarefy

Meaning

  1. To make rare, thin, porous, or less dense.
  2. To become rare, thin or less dense.

Pronounced as (IPA)
/ˈɹɛəɹəˌfaɪ/
Etymology

In summary

From Middle English rarefien, from Old French rarefier (French raréfier), from Latin rarefacere (“make rare”). By surface analysis, rare + -fy.

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