The process by which plants release water vapor into the air through tiny openings in their leaves.
From French *transpiration* and Latin *transpirare* “to breathe through,” from *trans-* “through” + *spirare* “to breathe.” At first it referred to the slow escape of moisture, then became a technical biology term.
A forest is like a giant, living humidifier: trees “exhale” water into the air all day long. In big forests like the Amazon, transpiration actually helps create clouds and even affects rainfall patterns far away.
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