cocket center
noun
variants or cocket centering
: an arch center or centering in which the horizontal tie beam is replaced by bracing that allows headway above the springers to permit passage through while building
Word History
Etymology
obsolete English cocket to mortise, join, from Italian cocchetta, diminutive of cocca notch, knot, probably from Latin coccum excrescence on a tree, berry of the scarlet oak