(astronautics) A rocket engine (rocket motor) that uses a solid propellant that, when combusted, generates gases which are used for rocket propulsion. / (astronautics) A rocket that uses such an engine.

plural of solid torus

Physically very solid; very difficult to move. / (figuratively) Very strong and dependable.

(geometry) The dual polyhedron of any Archimedean solid.

(simile) Extremely thick and heavy, so as to make it impossible to move. / (simile, of a person) Very reliable and dependable

(topology) The topological space that is a Cartesian product of the two-dimensional disk and the circle.

(geometry) The three-dimensional analog of an angle, equivalent to the area of that portion of the surface of a unit sphere that it subtends.

Alternative form of solid-state

shotgun cartridge with a single projectile

A solid produced by taking a particular two-dimensional curve and rotating it through 360° about an axis. The curve will sweep out a surface, and the region inside the surface defines a solid.