Synonyms and related words :
arc, bow, cadence, catacaustic, caustic, circle, conchoid, crook, curl, curve, decline, decurrence, diacaustic, droop, ellipse, festoon, hook, hyperbola, lapse, lituus, lowering, parabola, sag, sinkage, sinus, slump, submergence, subsidence, swag, tracery