n. [ OF. trestel, tresteay, F. tréteau; probably from L. transtillum a little crossbeam, dim. of transtrum a crossbeam. Cf. Transom. ] [ Written also tressel. ] 1. A movable frame or support for anything, as scaffolding, consisting of three or four legs secured to a top piece, and forming a sort of stool or horse, used by carpenters, masons, and other workmen; also, a kind of framework of strong posts or piles, and crossbeams, for supporting a bridge, the track of a railway, or the like. [ 1913 Webster ]

2. The frame of a table. [ 1913 Webster ]

Trestle board, a board used by architects, draughtsmen, and the like, for drawing designs upon; -- so called because commonly supported by trestles. --
Trestle bridge. See under Bridge, n. [ 1913 Webster ]

n. (Naut.) One of two strong bars of timber, fixed horizontally on the opposite sides of the masthead, to support the crosstrees and the frame of the top; -- generally used in the plural. Totten. [ 1913 Webster ]

n. A viaduct, pier, scaffold, or the like, resting on trestles connected together. [ 1913 Webster ]