1. the process by which plants lose water vapor through their leaves
Usage: biology
2. the process of giving off water vapor through the skin or lungs
Usage: biology; physiology

Examples

• Transpiration helps plants cool themselves on hot days.
• The rate of transpiration increases when humidity is low.
• Scientists measured transpiration by weighing the plant before and after exposure to light.
• Transpiration through the skin helps regulate body temperature.
• The forest’s transpiration contributes significantly to local humidity levels.
• Stomata on leaves control the rate of transpiration.
• During drought, plants reduce transpiration to conserve water.