Etymograph

English

trochoid

Trochoid comes from Ancient Greek τροχοειδής ‘round, circular’.

  1. Ancient Greekc. 800–300 BCEτροχοειδής1trokhoeidḗs‘round, circular’
  2. Englishtodaytrochoid1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English trochoid

Lineage

  1. Ancient Greekc. 800–300 BCEτροχοειδήςWiktionary, English trochoidtrokhoeidḗs‘round, circular’
  2. EnglishtodaytrochoidWiktionary, English trochoid

A compound of τροχός ‘wheel’ + εἶδος ‘form, image’

Proto-Indo-European *dʰregʰ- ‘to run, drag, pull’

Proto-Indo-European *dʰrogʰós

Ancient Greek τροχός ‘wheel’

Proto-Indo-European *weyd- ‘to see’

Proto-Indo-European *wéydos ‘seeing, image’

Proto-Hellenic *wéidos

Ancient Greek εἶδος ‘form, image’

Every English word from Ancient Greek τροχοειδής

Today it means

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

Sources

Sources: Wiktionary, “trochoid”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Ancient Greek τροχοειδής / trochoid

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