(astronomy) Any of the 8 celestial bodies which orbit the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune (a celestial body that fits the 2006 IAU definition of planet).

(astronomy) A theoretical type of terrestrial planet that could form, if protoplanetary discs are carbon-rich and oxygen-poor.

A planet that orbits the Sun within the orbit of the Earth, and thus does not show retrograde motion when viewed from Earth

A planet that orbits the Sun beyond the orbit of the Earth and thus shows retrograde motion when viewed from the Earth

(astrophysics) a planet that occupies a Trojan point of a star system

a silicate planet

a terrestrial planet composed mostly of silicate minerals

(astronomy, planets) A planet larger than terrestrial planets, composed mostly of gases and astronomical ices.

(planetology) a planet that flies through interstellar space and has no star to encircle

(science fiction) homeworld