The Collaborative International Dictionary of English v.0.48:

Apocrisiary \Ap`o*cris"i*a*ry\, Apocrisiarius
\Ap`o*cris`i*a"ri*us\, n. [L. apocrisiarius, apocrisarius, fr.
   Gr. ? answer, fr. ? to answer; ? from + ? to separate.]
   (Eccl.)
   A delegate or deputy; especially, the pope's nuncio or legate
   at Constantinople.
   [1913 Webster]