The Collaborative International Dictionary of English v.0.48:

Guardant \Guard"ant\, a. [OF. guardant, p. pr. of guard?. See
   Guard, v. t.]
   1. Acting as guardian. [Obs.] --Shak.
      [1913 Webster]

   2. (Her.) Same as Gardant.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Guardant \Guard"ant\, n.
   A guardian. [Obs.] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

guardant
    adj 1: looking forward [syn: guardant(ip), gardant(ip),
           full-face]