The Collaborative International Dictionary of English v.0.48:

Ceil \Ceil\ (s[=e]l), v. t. [imp. & p. p. Ceiled (s[=e]ld); p.
   pr. & vb. n. Ceiling.] [From an older noun, fr. F. ciel
   heaven, canopy, fr. L. caelum heaven, vault, arch, covering;
   cf. Gr. koi^los hollow.]
   1. To overlay or cover the inner side of the roof of; to
      furnish with a ceiling; as, to ceil a room.
      [1913 Webster]

            The greater house he ceiled with fir tree. --2
                                                  Chron. iii. 5
      [1913 Webster]

   2. To line or finish a surface, as of a wall, with plaster,
      stucco, thin boards, or the like.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "ceil":
   bonnet, cap, coif, cork, crown, dome, face, feather, fill, fur,
   hat, hood, inlay, interline, line, load, pack, pad, roof, roof in,
   stopper, stuff, tip, top, wad, wainscot