vulcanoid

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noun

A member of the hypothetical population of small asteroids orbiting in the dynamically stable zone between 0.08 and 0.21 AU from the Sun

Scrabble 15
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Meanings

vulcanoid1

nounvulcanoid (plural vulcanoids)

plural vulcanoids

  1. astronomyA member of the hypothetical population of small asteroids orbiting in the dynamically stable zone between 0.08 and 0.21 AU from the Sun
  2. broadlyinformalAn asteroid whose orbit is wholly within the orbit of Mercury.
adjectivevulcanoid (not comparable)
  1. not comparableastronomyOf or pertaining to a vulcanoid.

Vulcanoid2

nounVulcanoid (plural Vulcanoids)

plural Vulcanoids

  1. alternativeAlternative form of vulcanoid

Origin

From Vulcan + -oid, from the hypothetical planet Vulcan, erroneously believed to exist within the orbit of Mercury.

Full word history & related roots →
Cite this entry
APA

vulcanoid. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/vulcanoid

MLA

“vulcanoid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/vulcanoid. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “vulcanoid,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/vulcanoid.

Source: vulcanoid on Wiktionary, CC BY-SA 4.0.