The Collaborative International Dictionary of English v.0.48:

Sacristan \Sac"ris*tan\, n. [F. sacristain, LL. sacrista, fr. L.
   sacer. See Sacred, and cf. Sexton.]
   An officer of the church who has the care of the utensils or
   movables, and of the church in general; a sexton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sacristan
    n 1: an officer of the church who is in charge of sacred objects
         [syn: sexton, sacristan]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "sacristan":
   Bible clerk, Bible reader, acolyte, almoner, anagnost, beadle,
   bedral, capitular, capitulary, choir chaplain, churchwarden, clerk,
   deacon, deaconess, elder, elderman, lay elder, lay reader, lector,
   lecturer, parish clerk, precentor, reader, ruling elder, sacrist,
   sexton, shames, sidesman, succentor, suisse, teaching elder,
   thurifer, verger, vergeress