TRES'TLE, noun tres'l. 1. The frame of a table. 2. A movable form for supporting any thing. 3. In bridges, a frame consisting of two posts with a head or cross beam and braces, on which rest the string-pieces. [This is the use of the word in New England. It is vulgarly pronounced trussel or trussl.] Trestle-trees, in a ship, are two strong bars of timber, fixed horizontally on the opposite sides of the lower mast-head, to support the frame of the top and the top-mast.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI