[ad. It. casone, or OF. casson large chest, mod.F. caisson.] An occasional variant of CAISSON: a. an ammunition chest; b. Arch. a sunken panel. (= CAISSON 1 a, 3.)
1799. Chron., in Ann. Reg., 3/1. Twelve brass field pieces three pounders with their cassoons.
1850. Leitch, Müller’s Anc. Art, § 53. 27. The ornamental forms of the cassoons (φατνώματα, lacunaria).
