dew

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Water droplets condensed from the air, usually at night, onto cool surfaces.
• noun Something moist, fresh, pure, or renewing.
• noun Moisture, as in the form of tears or perspiration, that appears in small drops.
• transitive verb To wet with or as if with dew.

from The Century Dictionary.

• To wet with or as if with dew; moisten; bedew.
• An obsolete spelling of due.
• noun 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.
• noun Something likened to dew: As falling lightly, or as serving to refresh.
• noun As suggestive of the morning, and hence of freshness and youth.
• noun Moisture standing in little drops on anything.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To wet with dew or as with dew; to bedew; to moisten; as with dew.
• obsolete Same as due, or duty.
• noun Moisture from the atmosphere condensed by cool bodies upon their surfaces, particularly at night.
• noun Figuratively, anything which falls lightly and in a refreshing manner.
• noun An emblem of morning, or fresh vigor.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun uncountable moisture in the air that settles on plants, etc in the morning, resulting in drops.
• noun countable an instance of a such moisture settling on plants, etc.
• verb To wet with, or as if with, dew; to moisten.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun water that has condensed on a cool surface overnight from water vapor in the air