The Collaborative International Dictionary of English v.0.48:

Dew \Dew\ (d[=u]), n. [AS. de['a]w; akin to D. dauw, G. thau,
   tau, Icel. d["o]gg, Sw. dagg, Dan. dug; cf. Skr. dhav,
   dh[=a]v, to flow. [root]72. Cf. Dag dew.]
   1. Moisture from the atmosphere condensed by cool bodies upon
      their surfaces, particularly at night.
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            Her tears fell with the dews at even. --Tennyson.
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   2. Figuratively, anything which falls lightly and in a
      refreshing manner. "The golden dew of sleep." --Shak.
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   3. An emblem of morning, or fresh vigor. "The dew of his
      youth." --Longfellow.
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   Note: Dew is used in combination; as, dew-bespangled,
         dew-drenched, dewdrop, etc.
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The Collaborative International Dictionary of English v.0.48:

Dew \Dew\, v. t. [imp. & p. p. Dewed; p. pr. & vb. n.
   Dewing.]
   To wet with dew or as with dew; to bedew; to moisten; as with
   dew.
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         The grasses grew
         A little ranker since they dewed them so. --A. B.
                                                  Saxton.
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The Collaborative International Dictionary of English v.0.48:

Dew \Dew\, a. & n.
   Same as Due, or Duty. [Obs.] --Spenser.
   [1913 Webster] Dewar vessel
   Dewar

WordNet (r) 3.0 (2006):

dew
    n 1: water that has condensed on a cool surface overnight from
         water vapor in the air; "in the morning the grass was wet
         with dew"