A planetary object

(archaic, astronomy) A moon of a planet besides Earth; a secondary planet; a natural planetary satellite.

In a planetary manner or context; like planets.

(botany) A small-leaved North American tree (Planera aquatica) related to the elm, but having a wingless, nutlike fruit.

plural of planer tree

(poetic, obsolete) Of or relating to planets.

(Greek mythology) The five Greek gods of the "Wandering Stars", (i.e. "planets"), (Phaenon (Saturn), Phaethon (Jupiter), Pyroeis (Mars), Eosphorus/Hesperus (Venus), and Stilbon (Mercury). They were the sons of the Eos (goddess of the dawn) and Astraeus (god of the dusk), and their siblings were the four Anemoi ("winds").

plural of planetary aberration

(astronomy) A deviation of where a planet appears to be, due to the motion of the planet during the time that the light reaches the Earth.

(astronomy, celestial mechanics) An imaginary celestial body (corresponding to another, real, orbiting one) which orbits with constant speed along an auxiliary circle (a circle which shares a diameter with the major axis of the elliptical orbit of the corresponding real celestial body), such that its position coincides with the position of the corresponding, real celestial body when that body passes through periapsis.