The Collaborative International Dictionary of English v.0.48:

Daric \Dar"ic\ (d[a^]r"[i^]k), n. [Gr. dareiko`s, of Persian
   origin.]
   1. (Antiq.)
      (a) A gold coin of ancient Persia, weighing usually a
          little more than 128 grains, and bearing on one side
          the figure of an archer.
      (b) A silver coin of about 86 grains, having the figure of
          an archer, and hence, in modern times, called a daric.
          [1913 Webster]

   2. Any very pure gold coin.
      [1913 Webster]

Easton's 1897 Bible Dictionary:

Daric
   in the Revised Version of 1 Chr. 29:7; Ezra 2:69; 8:27; Neh.
   7:70-72, where the Authorized Version has "dram." It is the
   rendering of the Hebrew darkemon and the Greek dareikos. It was
   a gold coin, bearing the figure of a Persian King with his crown
   and armed with bow and arrow. It was current among the Jews
   after their return from Babylon, i.e., while under the Persian
   domination. It weighed about 128 grains troy, and was of the
   value of about one guinea or rather more of our money. It is the
   first coin mentioned in Scripture, and is the oldest that
   history makes known to us.