A convexly carved plate or cupola in which there are three or four holes for finger holds seem to have been lids.
Paired tentacles short, proximally thick and convexly bulging, abruptly narrowed to an acute tip with incurving sides.
1570s, from Middle French convexe, from Latin convexus "vaulted, arched," past participle of convehere "to bring together," from com- "together," or "thoroughly" (see com-) + vehere "to bring" (see vehicle). Possibly from the idea of vaults carried together to meet at the point of a roof. Related: Convexity. Convex lens is from 1822.
convex con·vex (kŏn'věks', kən-věks')
Having a surface or boundary that curves or bulges outward, as the exterior of a sphere.