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English
Etymology
From planet + -oid.
Pronunciation
Noun
planetoid (plural planetoids)
- (astronomy, dated) An asteroid of any size
- (astronomy, dated) An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
- (astronomy) A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
- (astronomy) Any planetary body, including classical planets and moons: a planetary-mass object
2018 January, Stern, Gerya & Tackley, “Stagnant lid tectonics: Perspectives from silicate planets, dwarf planets, large moons, and large asteroids”, in Geoscience Frontiers, volume 9, number 1, pages 103-119:Plate tectonics is a style of convection for an active planetoid where lid fragment (plate) motions reflect sinking of dense lithosphere in subduction zones […] In 2015 humanity completed a 50+ year effort to survey the 30 largest planets, asteroids, satellites, and inner Kuiper Belt objects, which we informally call “planetoids”.
- (astronomy) A dwarf planet
2006, Mike Brown, “Sedna”, in (Please provide the book title or journal name):We prefer the word "planetoid" as a new word to describe round objects orbiting the sun.
2007, Hannu Karttunen et al., editors, Fundamental Astronomy, 5th edition, page 131:A dwarf planet or a planetoid is a celestial body that [...]
2010, Mike Brown, How I Killed Pluto and Why It Had It Coming, page 223:'Dwarf planet' is a dumb phrase. For years we've called things like Pluto and Xena 'planetoids'—planetlike.
Usage notes
The term "planetoid" has never been precisely defined. At first, it was a synonym for asteroid; whereas "asteroid" referred to the star-like image seen through a telescope, "planetoid" referred to its planet-like orbit. Though it approached the popularity of "asteroid" ca. 1915, this usage was never dominant, and largely ceased by ca. 1980. Even before then the etymology of the term was reanalyzed as meaning planet-like in form, and started being used for larger asteroids such as Vesta which had planet-like geologies (that is, were planetary bodies). There was an increase in such usage after 2000 with the discovery of planetary bodies in the Kuiper belt and beyond, which many felt were not appropriately called "asteroids" and concomitant with doubts as to the appropriate definition of "planet". Sedna, for example, was called a "planetoid" in its discovery announcement.
Translations
any of several larger astral bodies
See also
Further reading
Anagrams
Romanian
Etymology
Borrowed from French planétoïde. By surface analysis, planetă + -oid.
Noun
planetoid m (plural planetoizi)
- (astronomy) planetoid
Declension