Tran`spi*ra"tion (?), n. [F. transpiration.] 1. (Physiol.) 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.

2. (bot.) The evaporation of water, or exhalation of aqueous vapor, from cells and masses of tissue.

3. (Physics) The passing of gases through fine tubes, porous substances, or the like; as, transpiration through membranes.

Tran`spi*ra"tion (?), n. [F. transpiration.] 1. (Physiol.) 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.

2. (bot.) The evaporation of water, or exhalation of aqueous vapor, from cells and masses of tissue.

3. (Physics) The passing of gases through fine tubes, porous substances, or the like; as, transpiration through membranes.

• (biology) the loss of water by evaporation in terrestrial plants, especially through the stomata; accompanied by a corresponding uptake from the roots
  
• the process of giving off water vapour through the skin or mucous membranes
  
• the passage of gases through fine tubes