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The exposure of a liquid in large surfaces to the air, so as to hasten its evaporation.

An apparatus for diffusing a solution, as brine or vinegar, over a large surface, for exposure to the air.

One who, or that which, guards from injury, danger, exposure, or attack; defense; protection. His greatness was no guard to bar heaven's shaft. Shak.

The criminality and consequent exposure to punishment resulting from willful disobedience of law, or from morally wrong action; teh state of one who has broken a moral or political law; crime; criminality; offense against right. Satan had not answer, but stood struck With guilt of his own sin. Milton.…

gum and mixing other ingredients. -- Gum resin, the milky juice of a plant solidified by exposure to air; one of certain inspissated saps, mixtures of, or having properties of, gum and resin; a resin containing more or less mucilaginous and gummy matter. -- Gum sandarac. See Sandarac. -- Gum Senegal, a gum similar t…

ssive, or above that which is normal to the human body; the bodily feeling experienced on exposure to fire, the sun's rays, etc.; the reverse of cold.

To make brown; to obscure; to darken; to tan; as, features imbrowned by exposure. The mountain mass by scorching skies imbrowned. Byron.

or. Period of incubation, or Stage of incubation (Med.), the period which elapses between exposure to the causes of a disease and the attack resulting from it; the time of development of the supposed germs or spores.

le power from above. Sprat. Indelible colors, fast colors which do not fade or tarnish by exposure. -- Indelible ink, an ink obliterated by washing; esp., a solution of silver nitrate.

To bring on; to effect; to cause; as, a fever induced by fatigue or exposure. Sour things induces a contraction in the nerves. Bacon.

To make hard; as, extreme heat indurates clay; some fossils are indurated by exposure to the air.

To dry in, or to expose to, the sun's rays; to ripen or prepare by such exposure. Johnson.

Exposure of a patient to the sun's rays; a sun bath.

Pepsin modified by exposure to a temperature of from 40º to 60º C.

Exposure to death, loss, or injury; hazard; danger. There came down a storm of wind on the lake; and they were filled with water, and were in jeopardy. Luke viii. 23. Look to thyself, thou art in jeopardy. Shak.

Damaged by accidental exposure to light; light-fogged; -- said of plates or films.

Linseed oil brought to various degrees of hardness by some oxidizing process, as by exposure to heated air, or by treatment with chloride of sulphur. In this condition it is used for many of the purposes to which India rubber has been applied.

, a paint made up with some phosphorescent substance, as sulphide of calcium, which after exposure to a strong light is luminous in the dark for a time.

A picture produced by a process in which development after exposure may be deferred indefinitely, so as to permit transportation of exposed plates; also, the process itself.

The morbid condition produced by the excessive use of mercury, or by exposure to its fumes, as in mining or smelting.