ceil

Etymology 1

Uncertain; perhaps related to Latin cēlō (“to hide”).

verb

  1. (transitive) To line or finish (a surface, such as a wall), with plaster, stucco, thin boards, or similar.

Etymology 2

Abbrevation of ceiling, influenced by French ciel

noun

  1. (poetic) A ceiling.
    […] The mossy sward / Beneath their feet, their carpet was, / An azure ceil, the sky above; […] 1890, Ambrose E. Pratt, Two Hundred and Fiftieth Anniversary Celebration of Sandwich and Bourne, at Sandwich, Massachusetts, September 3, 1889, page 89
  2. (mathematics) Abbreviation of ceiling.

verb

  1. (mathematics) To set a higher bound.

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