altar boy

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A boy who is an altar server.

from The Century Dictionary.

• noun A boy who serves a priest while he is officiating at the altar.

from the GNU version of the Collaborative International Dictionary of English.

• noun a boy who assists a priest at the clebration of the Holy Mass and other forms of public worship; -- also called acolyte.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A boy serving as an acolyte in certain forms of Christianity.
• noun A young man, adhering to traditional values.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a boy serving as an acolyte