Capable of being breathed out or exhaled; able to be expelled as breath or vapor.
From 'exhale' + the suffix '-able' meaning 'capable of.' Describes something that can be exhaled.
Some molecules you inhale are 'exhalable'—your body doesn't absorb them, so you simply breathe them back out, which is why you can smell garlic on someone's breath even after they've brushed their teeth.
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