Noun | 1. | ![]() building, edifice - a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice" planetarium - an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome |
2. | planetarium - an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome optical device - a device for producing or controlling light planetarium - a building housing an instrument for projecting the positions of the planets onto a domed ceiling | |
3. | planetarium - an apparatus or model for representing the solar systems simulation, model - representation of something (sometimes on a smaller scale) orrery - planetarium consisting of an apparatus that illustrates the relative positions and motions of bodies in the solar system by rotation and revolution of balls moved by wheelwork; sometimes incorporated in a clock |