n.
Function: noun
Etymology: Middle English trais, from Anglo-French tres, plural of trait pull, draft, trace ― more at TRAIT
Date: 14th century
1 : either of two straps, chains, or lines of a harness for attaching a draft animal to something (as a vehicle) to be drawn
2 : LEADER 1E(2)
3 : one or more vascular bundles supplying a leaf or twig