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

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

plural of solid rocket

(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.

(military, artillery, dated) A solid round shot or cannonball.

(US politics, historical) The electoral support of the Southern United States for Democratic Party candidates for nearly a century from 1877, the end of the Reconstruction, to 1964.

plural of solid torus

(geometry) The dual polyhedron of any Archimedean solid.

plural of solid angle

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