A hemispherical roof.

A shallow raised structure on the moon's surface with a smooth convex cross section and a diameter anywhere from a few kilometers up to about 80 kilometers (50 miles).

An open crystal form consisting of two faces astride a symmetry plane.

The portion of a cylindrical container used in a filament-winding process that forms an integral end of the container.

An enclosure for a sonar transducer, projector, or hydrophone and associated equipment; designed to have minimum effect on sound waves traveling underwater.

1. A circular or elliptical, almost symmetrical upfold or anticlinal type of structural deformation.

2. A large igneous intrusion whose surface is convex upward.

The mound of water spray created in air when the shock wave from an underwater detonation of an atomic weapon reaches the surface.