v. i. [ imp. & p. p. Evaporated p. pr. & vb. n. Evaporating ] [ L. evaporatus, p. p. of evaporare; e out + vapor steam or vapor. See Vapor. ] 1. To pass off in vapor, as a fluid; to escape and be dissipated, either in visible vapor, or in particles too minute to be visible. [ 1913 Webster ]

2. To escape or pass off without effect; to be dissipated; to be wasted, as, the spirit of a writer often evaporates in the process of translation. [ 1913 Webster ]

To give moderate liberty for griefs and discontents to evaporate . . . is a safe way. Bacon. [ 1913 Webster ]

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. [ 1913 Webster ]

2. To expel moisture from (usually by means of artificial heat), leaving the solid portion; to subject to evaporation; as, to evaporate apples. [ 1913 Webster ]

3. To give vent to; to dissipate. [ R. ] [ 1913 Webster ]

My lord of Essex evaporated his thoughts in a sonnet. Sir. H. Wotton. [ 1913 Webster ]

Evaporating surface (Steam Boilers), that part of the heating surface with which water is in contact. [ 1913 Webster ]

a. [ L. evaporatus, p. p. ] Dispersed in vapors. Thomson. [ 1913 Webster ]

adj. reduced in volume by having moisture expelled before canning; same as condensed, 3; as, unsweetened evaporated milk. [ prenominal ]
Syn. -- condensed(prenominal). [ WordNet 1.5 ]

n. [ L. evaporatio: cf. F. évaporation. ] 1. The process by which any substance is converted from a liquid state into, and carried off in, vapor; as, the evaporation of water, of ether, of camphor. [ 1913 Webster ]

2. The transformation of a portion of a fluid into vapor, in order to obtain the fixed matter contained in it in a state of greater consistence. [ 1913 Webster ]

3. That which is evaporated; vapor. [ 1913 Webster ]

4. (Steam Engine) See Vaporization. [ 1913 Webster ]

a. [ L. evaporatius: cf. F. évaporatif. ] Pertaining to, or producing, evaporation; as, the evaporative process. [ 1913 Webster ]

n. 1. An apparatus for condensing vegetable juices, or for drying fruit by heat. [ 1913 Webster ]

2. Any device designed to evaporate a fluid. [ PJC ]

3. Specifically: The portion of a refrigeration system in which the refrigerant evaporates and thus absorbs heat. [ PJC ]

rotary evaporator (Chem.) a device used in laboratories in which a liquid is evaporated by reducing the pressure and applying heat, while rotating the liquid in a vessel such as a round-bottomed flask. The reduced pressure speeds the evaporation process and allows the evaporation to be conducted at temperatures lower than would otgherwise be possible, thus reducing decomposition of unstable substances. The rotation also serves to increase the surface area from which evaporation takes place and to reduce the effect of "bumping", the sudden burst of vaporization that can scatter liquid exposed to reduced pressure. [ PJC ]