Source : Webster's Revised Unabridged Dictionary (1913)

Fro \Fro\ (fr[=o]), adv. [OE. fra, fro, adv. & prep., Icel.
   fr[=a], akin to Dan. fra from, E. from. See {From}.]
   From; away; back or backward; -- now used only in opposition
   to the word to, in the phrase to and fro, that is, to and
   from. See {To and fro} under {To}. --Milton.

Fro \Fro\, prep.
   From. [Obs.] --Chaucer.