16-letter words containing f, e, r, d, u, t
- treaty of verdun — an agreement reached in 843 ad by three grandsons of Charlemagne, dividing his empire into an E kingdom (later Germany), a W kingdom (later France), and a middle kingdom (containing what became the Low Countries, Lorraine, Burgundy, and N Italy)
- twofold purchase — a purchase using a double standing block and a double running block so as to give a mechanical advantage of four or five, neglecting friction, depending on whether the hauling is on the standing block or the running block.
- undifferentiable — capable of being differentiated.
- undifferentiated — to form or mark differently from other such things; distinguish.