ceil

1. To provide or cover with a ceiling.
2. Nautical. To provide (a ship) with interior planking or lining.

[Middle English celen, probably from Old French *celer, from Latin caelāre, to carve, from caelum, chisel. See Caelum.]

1. To provide with a ceiling.
2. To provide with a wainscot finish; to sheathe internally.