E‐vap″o‐rate, v. t. 1. To convert from a liquid or solid state into vapor (usually) by the agency of heat; to dissipate in vapor or fumes.
2. To expel moisture from (usually by means of artificial heat), leaving the solid portion; to subject to evaporation; as, to evaporate apples.
3. To give vent to; to dissipate.
My lord of Essex evaporated his thoughts in a sonnet. Sir. H. Wotton.
Evaporating surface(Steam Boilers), that part of the heating surface with which water is in contact.