Source : Webster's Revised Unabridged Dictionary (1913)

Adown \A*down"\, adv. [OE. adun, adoun, adune. AS. of d[=u]ne
   off the hill. See {Down}.]
   From a higher to a lower situation; downward; down, to or on
   the ground. [Archaic] ``Thrice did she sink adown.''
   --Spenser.

Adown \A*down"\, prep.
   Down. [Archaic & Poetic]

         Her hair adown her shoulders loosely lay displayed.
                                                  --Prior.