dew

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Water droplets condensed from the air, usually at night, onto cool surfaces.
2. n. Something moist, fresh, pure, or renewing: "The timely dew of sleep/. . . inclines/Our eye-lids” ( John Milton).
3. n. Moisture, as in the form of tears or perspiration, that appears in small drops.
4. v. To wet with or as if with dew.

Century Dictionary and Cyclopedia

1. n. The aqueous vapor which is deposited from the atmosphere by condensation, especially during the night, in the form of small drops on the surface of bodies. The formation of dew is explained by the loss of heat by bodies on the earth's surface through radiation at night, by which means they and the air immediately about them are cooled below the dew-point (which see). Dew is thus deposited chiefly on bodies which are good radiators and poor conductors of heat, like grass; hence also it appears chiefly on calm and clear nights—that is, when the conditions are most favorable for radiation. It never appears on nights both cloudy and windy. In winter dew becomes hoar frost.
2. n. Something likened to dew: As falling lightly, or as serving to refresh.
3. n. As suggestive of the morning, and hence of freshness and youth.
4. n. Moisture standing in little drops on anything.
5. To wet with or as if with dew; moisten; bedew.
6. An obsolete spelling of due.

Wiktionary

1. n. moisture in the air that settles on plants, etc in the morning, resulting in drops.
2. n. an instance of a such moisture settling on plants, etc.
3. v. To wet with, or as if with, dew; to moisten.

GNU Webster's 1913

1. n. Moisture from the atmosphere condensed by cool bodies upon their surfaces, particularly at night.
2. n. Figuratively, anything which falls lightly and in a refreshing manner.
3. n. An emblem of morning, or fresh vigor.
4. v. To wet with dew or as with dew; to bedew; to moisten; as with dew.
5. Same as due, or duty.

WordNet 3.0

1. n. water that has condensed on a cool surface overnight from water vapor in the air