recognizor

from The Collaborative International Dictionary of English v.0.48

Recognizor \Re*cog`ni*zor"\ (r[-e]*k[o^]g`n[i^]*z[^o]r" or
   r[-e]*k[o^]n`[i^]*z[^o]r"), n. (Law)
   One who enters into a recognizance. [Written also
   {recognisor}.] --Blackstone.
   [1913 Webster]