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"What work?" said Mrs. Doyle, resting an absent-minded blue gaze on the lustrous convolutions of Aldo's hair, on his white, narrow forehead, on his intense and violent eyes, and the scarlet arcuation of his vivid lips.

For these latter edifices the old manor-houses, with their many mullioned windows and Tudor arcuation, formed the basis for design, and machicoli, turrets, and open timber roofs became the fashion for country-houses; but the city dwellings were erected in a style that was a compromise between the Georgian and the semi-Gothic, the most difficult problem being to reconcile the double hung sash with the pointed arches of mediæval precedent.

If the elliptical arch be equally strong with the semicircular; that is, if an arch, by approaching to a straight line, loses none of its stability, it will follow, that all arcuation is useless, and that the bridge may at last, without any inconvenience, consist of stone laid in straight lines from pillar to pillar.

Curvature -- N. curvature, curvity†, curvation†; incurvature†, incurvity†; incurvation†; bend; flexure, flexion, flection†; conflexure†; crook, hook, bought, bending; deflection, deflexion†; inflection, inflexion†; concameration†; arcuation†, devexity†, turn, deviation, detour, sweep; curl, curling; bough; recurvity†, recurvation†; sinuosity &c.