transpiration Meaning, Definition & Usage

  1. noun the passage of gases through fine tubes because of differences in pressure or temperature
  2. noun the process of giving off or exhaling water vapor through the skin or mucous membranes
  3. noun the emission of water vapor from the leaves of plants

WordNet

Tran`spi*ra"tion noun
Etymology
F. transpiration.
Definitions
  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.

Webster 1913