trestle

n. 1 supporting structure for a table etc., consisting of two frames fixed at an angle or hinged, or of a bar with two divergent pairs of legs. 2 (in full trestle-table) table of a board or boards on trestles etc. 3 (in full trestle-work) open braced framework to support a bridge etc. [latin transtrum cross-beam]

n. 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.