The Collaborative International Dictionary of English v.0.48:

Archimandrite \Ar`chi*man"drite\, n. [L. archimandrita, LGr. ?;
   pref. ? (E. arch-) + ? an inclosed space, esp. for cattle, a
   fold, a monastery.] (Gr. Church)
      (a) A chief of a monastery, corresponding to abbot in the
          Roman Catholic church.
      (b) A superintendent of several monasteries, corresponding
          to superior abbot, or father provincial, in the Roman
          Catholic church.
          [1913 Webster]

WordNet (r) 3.0 (2006):

archimandrite
    n 1: the superior of an abbey of monks [syn: abbot,
         archimandrite]