(n.) The state of being convex; convexity.

amplitude apse arcade arcature arch arched roof archway bellying bulging ceilinged roof concameration concha convexedness convexity convexness cove cupola dome excurvation excurvature flight path geodesic dome gibbosity gibbousness igloo keystone ogive skewback skin effect skin friction slip span stagger tuberosity tuberousness vault vaulting voussoir