| n. | 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; |
| 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; |
| Noun | 1. | transpiration - the passage of gases through fine tubes because of differences in pressure or temperature |
| 2. | transpiration - the process of givng off or exhaling water vapor through the skin or mucous membranes | |
| 3. | transpiration - the emission of water vapor from the leaves of plants |