trochoid

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noun

The curve traced by a point on a circle as it rolls along a straight line

OriginAncient Greek τροχοειδής →
Scrabble 14
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Meanings

nountrochoid (plural trochoids)

plural trochoids

  1. geometryThe curve traced by a point on a circle as it rolls along a straight line
  2. biologyAn organism or fossil with a trochoid shell (especially one in the gastropod family Trochidae), or the shell itself.
adjectivetrochoid (comparative more trochoid, superlative most trochoid)

comparative more trochoid · superlative most trochoid

  1. Capable of rolling.
  2. Allowing rotation.
  3. biologyHigh-spired; conical.

Origin

  1. Ancient Greekτροχοειδής
  2. Englishtrochoid

From Ancient Greek τροχοειδής (trokhoeidḗs), from τροχός (trokhós, “wheel”) + εἶδος (eîdos, “form, image”).

More words from Ancient Greek

Full word history & related roots →
Cite this entry
APA

trochoid. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/trochoid

MLA

“trochoid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/trochoid. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “trochoid,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/trochoid.

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