trésaillecommon nounSyllable DecompositiontrésailleEtymologyexpand(1765) from Old French teseiller, from teser, "to stretch," itself from popular Latin tensare. (1680) tréseille. see étrésillonDefinition1. In carts and wagons, a horizontal piece that holds the side panels.expandPluraltrésaillesSee alsotrésailles (v.)