n. [ OF. trestel, tresteay, F. tréteau; probably from L. transtillum a little crossbeam, dim. of transtrum a crossbeam. Cf. Transom. ]
Trestle board,
Trestle bridge.
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 ]