Main Entry: tres·tle

Variant(s): also tres·sel \ˈtre-səl also ˈtrə-\

Function: noun

Etymology: Middle English trestel, from Anglo-French, from Vulgar Latin *trastellum, from Latin transtillum, diminutive of transtrum traverse beam, from trans across — more at through

Date: 13th century

1 : a braced frame serving as a support
2 : horse 2b
3 : a braced framework of timbers, piles, or steelwork for carrying a road or railroad over a depression