American Heritage® Dictionary of the English Language, Fourth Edition
- n. See asteroid.
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. The diameter of the largest is supposed not to exceed 450 miles, while most of the others are believed to be very much smaller. Ceres was the first to be detected, being observed for the first time by Piazzi, an Italian astronomer, on January' 1st, 1801; since 1847 no year has passed without the discovery of new planetoids. The number now known exceeds 290; 10 were discovered in 1888, 6 in 1889, and 5 in the first four months of 1890.
- n. See minor planet.
- n. astronomy An asteroid of any size
- n. astronomy An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
- n. astronomy A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
- n. astronomy A dwarf planet
GNU Webster's 1913
- n. (Astron.) A body resembling a planet; an asteroid.
- n. any of numerous small celestial bodies that move around the sun
“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.”
These user-created lists contain the word ‘planetoid’.
A list of words that are odd or words that I have looked up.
words taking the suffix -oid. because i wanted to use the word zomboid as in "having the likeness of a zombie". and yes, flavenoids is adopted. we'll tell her when she's older...
heat death, End of Greatness, dark flow, Lyman-alpha forest, supervoid, redshift, weakly interactin..., robust associatio..., light dark matter, dark matter halo, Great Attractor, warm dark matter and 101 more...
Types of planets.
Looking for tweets for planetoid.