| Caisson 1. (n.) A chest to hold ammunition. 2. (n.) A four-wheeled carriage for conveying ammunition, consisting of two parts, a body and a limber. In light field batteries there is one caisson to each piece, having two ammunition boxes on the body, and one on the limber. 3. (n.) A chest filled with explosive materials, to be laid in the way of an enemy and exploded on his approach. 4. (n.) A water-tight box, of timber or iron within which work is carried on in building foundations or structures below the water level. 5. (n.) A hollow floating box, usually of iron, which serves to close the entrances of docks and basins. 6. (n.) A structure, usually with an air chamber, placed beneath a vessel to lift or float it. 7. (n.) A sunk panel of ceilings or soffits. Thesaurus Entries ammunition box, ark, attache case, bag, bandolier, barrel, basket, billfold, bin, boot, bottle, box, box up, briefcase, bunker, caisson, can, canister, capsula, capsule, cardcase, case, cask, casket, cedar chest, chest, cigarette case, cist, coffer, coffin, compact, cone, crate, crib, dispatch box, encase, encyst, envelope, etui, file, file folder, filing box, folio, hamper, holster, hope chest, housewife, hussy, hutch, jar, kit, letter file, monstrance, ostensorium, pack, package, packet, packing case, parcel, pillbox, pod, portfolio, pot, powder box, quiver, rack, reliquary, sack, sarcophagus, scabbard, sheath, skippet, snuffbox, socket, spectacle case, tank, tea chest, till, tin, tinderbox, vanity case, vasculum, wallet |