From The Collaborative International Dictionary of English v.0.48:
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.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Fro \Fro\, prep.
From. [Obs.] --Chaucer.
[1913 Webster]