Rarefy – To make less dense

(Pronounced rair-uh-fye)

To remember the definition of the word rarefy, use the following mnemonic:

It was rare that she had to modify (rarefy) her cake mixture, but she wanted the next batch to be a bit less dense than the last.

Examples of rarefy in a sentence

She need to start her bread dough again as she was unable to rarefy the current batch.

He needed to rarefy his schedule as it was so densely packed he had no time to spend with his family. 

They needed to rarefy the zeppelin if they ever wanted to see it fly.