Source : Webster's Revised Unabridged Dictionary (1913)

Suer \Su"er\, n.
   One who sues; a suitor.

Source : WordNet®

suer
     n 1: a man who courts a woman; "a suer for the hand of the
          princess" [syn: {suitor}, {wooer}]
     2: someone who petitions a court for redress of a grievance or
        recovery of a right [syn: {petitioner}]