evaporation

EVAPORA'TION, n. The conversion of a fluid into vapor specifically lighter than the atmospheric air. Evaporation is increased by heat and is followed by cold. It is now generally considered as a solution in the atmosphere.

1. The act of flying off in fumes; vent; discharge.

2. In pharmacy, the operation of drawing off a portion of a fluid in steam, that the remainder may be of a greater consistence, or more concentrated.