transpiration, n. [F. transpiration.].
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The act or process of transpiring or excreting in the form of vapor; exhalation, as through the skin or other membranes of the body; as, pulmonary transpiration, or the excretion of aqueous vapor from the lungs. Perspiration is a form of transpiration. Cudworth. [1913 Webster]
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The evaporation of water, or exhalation of aqueous vapor, from cells and masses of tissue. [1913 Webster]
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The passing of gases through fine tubes, porous substances, or the like; as, transpiration through membranes. [1913 Webster]