planet

UK: ˈplæn.ɪt | US: ˈplæn.ɪt

Definition

  1. n. a celestial body moving in an elliptical orbit around a star

  2. n. (archaic) a wandering celestial object (historically including the Sun and Moon)

Structure
plan <wander>et <diminutive suffix>plan <wander>et <diminutive suffix>
Etymology

The word "planet" originates from the Greek concept of celestial "wanderers" (planētai), contrasting with stationary stars. Early astronomers like Ptolemy classified the Sun, Moon, and five visible planets (Mercury to Saturn) as such due to their irregular paths. The modern definition narrowed after Copernicus established heliocentrism.

Examples

  1. Earth is the third planet from the Sun.

  2. Ancient cultures tracked planets like Mars and Venus.

  3. The telescope revealed details of the gas giant planet.

  4. Pluto was reclassified as a dwarf planet in 2006.

  5. Scientists search for habitable planets beyond our solar system.