n.1 a supporting structure for a table etc., consisting of two frames fixed at an angle or hinged or of a bar supported by two divergent pairs of legs.
2 (in full trestle-table) a table consisting of a board or boards laid on trestles or other supports.
3 (in full trestle-work) an open braced framework to support a bridge etc.
4 (in full trestle-tree) Naut. each of a pair of horizontal pieces on a lower mast supporting the topmast etc.
Etymology: ME f. OF trestel ult. f. L transtrum