- rarefy⇄rarefy, verb, -fied,-fying.
- rarefy⇄v.i. to become less dense. Also, rarify.
- rarefy⇄v.t. 1. to make less dense.
Ex. The air on high mountains is rarefied.
2. (Figurative.) to refine; purify.
Ex. Love is a gentle flame that rarefies ... her whole being (William Hazlitt).
3. (Figurative.) to make (an idea) subtle