The Collaborative International Dictionary of English v.0.48:

Dehors \De*hors"\, prep. [F., outside.] (Law)
   Out of; without; foreign to; out of the agreement, record,
   will, or other instrument.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dehors \De*hors"\, n. (Mil.)
   All sorts of outworks in general, at a distance from the main
   works; any advanced works for protection or cover. --Farrow.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

DEHORS. Out of; without. By this word is understood something out of the
record, agreement, will, or other thing spoken of; something foreign to the
matter in question.