from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See asteroid.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An asteroid of any size
- n. An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
- n. A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
- n. A dwarf planet
from the GNU version of the Collaborative International Dictionary of English
- n. A body resembling a planet; an asteroid.
from The Century Dictionary and Cyclopedia
- n. One of the group of very small planets revolving round the sun between the orbits of Mars and Jupiter, remarkable for the eccentricity of their orbits and the greatness of their angle of inclination to the ecliptic; a minor planet; an asteroid.
- n. See minor planet.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of numerous small celestial bodies that move around the sun
Sorry, no etymologies found.
We don't have a good definition for planet, but this thing is a little bit smaller than something I'd be willing to call a planet, so we sort of made up the name planetoid to try to describe what it is.
BROWN: Actually, as it stands right now, I would say there only eight planets, because I would say Pluto really deserves to be called a planetoid, too.
It's not very big, but suddenly the planetoid is the talk of the solar system.
The Paraman The small, fuse-replacing servo which had caused near panic among the entire population of, a planetoid was a funny little thing.
Unless the Earth atmosphere derived from earlier impacts such as Theia in which, as I understand it, astronomers have models suggesting that Earth captured most of both "planetoid" atmospheres and left the Moon airless, there likely wasn't a primitive atmosphere for abiogenesis to occur in before the LHB.
Today, CalTech astronomers announced the discovery of a "planetoid" eight billion miles from Earth, or more more than three times the distance of Pluto.
The new "planetoid," named Sedna after an Inuit goddess who created the sea creatures of the Arctic, is by far the coldest and most distant object known to orbit the sun, a team of researchers announced.
But I kind of like the word "planetoid," because planetoid it means planet-like.
One of the great cosmic tragedies in the past few years was the sad demotion of Pluto from a planet to a mere "planetoid".
Chiron is a “planetoid”, also thought of as an asteroid but slightly bigger than most asteroids, or possibly it is a trapped comet originating from the Kuiper Belt.