1. makes or becomes thin, less dense, or more refined
Usage: third person singular present tense of ‘rarefy’

Examples

• The high altitude rarifies the air, making breathing difficult.
• Heat rarifies the gas in the balloon, causing it to rise.
• The mountain climate rarifies the atmosphere significantly.
• As the mixture heats up, it rarifies and expands.
• The process rarifies the metal to create a lighter alloy.
• Distance rarifies sound waves traveling through space.