Source : Webster's Revised Unabridged Dictionary (1913)

Ministrant \Min"is*trant\, a. [L. ministrans, -antis, of
   ministrare to minister.]
   Performing service as a minister; attendant on service;
   acting under command; subordinate. ``Princedoms and
   dominations ministrant.'' --Milton. -- n. One who ministers.

Source : WordNet®

ministrant
     adj : serving attendance on someone; "a ministering angel"; "the
           angels ministrant sang"; "the attending physician"
           [syn: {ministering}, {attending}]
     n : someone who serves as a minister