ceil

[seel] /sil/
verb (used with object)
1.
to overlay (the ceiling of a building or room) with wood, plaster, etc.
2.
to provide with a ceiling.
Origin
1400-50; late Middle English celen to cover, to panel < ?
British Dictionary definitions for ceil

ceil

/siːl/
verb (transitive)
1.
to line (a ceiling) with plaster, boarding, etc
2.
to provide with a ceiling
Word Origin
C15 celen, perhaps back formation from ceiling