n. [ See Cell, v. t. ] 1. (Arch.) (a) The inside lining of a room overhead; the under side of the floor above; the upper surface opposite to the floor. (b) The lining or finishing of any wall or other surface, with plaster, thin boards, etc.; also, the work when done. [ 1913 Webster ]
2. (Naut.) The inner planking of a vessel. [ 1913 Webster ]
Camp ceiling. See under Camp. -- Ceiling boards, Thin narrow boards used to ceil with. [ 1913 Webster ]