ˌtranzpəˈrāshən, ˌtraan-, -n(t)sp- noun
( -s )
Etymology: Middle French from transpirer + -ation
: an act, process, or instance of transpiring: as
a. : the passage of fluid (as water) through skin or animal membrane in the form of a vapor ; also : something that is transpired : perspiration
b. : the emission or exhalation of watery vapor from the surfaces of leaves or other parts of plants
c. : the passing of gases through fine tubes or porous substances because of differences of pressure or temperature — compare thermal transpiration