Source : Webster's Revised Unabridged Dictionary (1913)

Dank \Dank\, a. [Cf. dial, Sw. dank a moist place in a field,
   Icel. d["o]kk pit, pool; possibly akin to E. damp or to
   daggle dew.]
   Damp; moist; humid; wet.

         Now that the fields are dank and ways are mire.
                                                  --Milton.

         Cheerless watches on the cold, dank ground. --Trench.

Dank \Dank\, n.
   Moisture; humidity; water. [Obs.]

Dank \Dank\, n.
   A small silver coin current in Persia.

Source : WordNet®

dank
     adj : unpleasantly cool and humid; "a clammy handshake"; "clammy
           weather"; "a dank cellar"; "dank rain forests" [syn: {clammy}]