altar boy

from WordNet (r) 3.0 (2006)

altar boy
    n 1: a boy serving as an acolyte

from The Collaborative International Dictionary of English v.0.48

altar boy \al"tar boy\, n.
   a boy who assists a priest at the clebration of the Holy Mass
   and other forms of public worship; -- also called {acolyte}.
   [PJC]