The Collaborative International Dictionary of English v.0.48:
Vestryman \Ves"try*man\, n.; pl. Vestrymen. A member of a vestry; especially (Prot. Epis. Ch.), a member other than a warden. See Vestry. [1913 Webster]WordNet (r) 3.0 (2006):
vestryman n 1: a man who is a member of a church vestry