convex: [16] Convex was borrowed from Latin convexus, mainly an architectural term meaning ‘arched, vaulted’. The element -vexus probably came from vehere ‘carry’ (source of English vehicle), the notion being that vaults are ‘carried together’ (Latin com- ‘together’) to meet at a point at the centre of a roof, although some have speculated that it is related to Latin vārus ‘bent, knock-kneed’ (source of English prevaricate). => vehicle, vex[convex etymology, convex origin, 英语词源]