Etymograph

English

thyro-

Thyro- comes from New Latin thyreoīdēs, from Ancient Greek θῠρεοειδής ‘Shield-shaped’, and ultimately from Proto-Indo-European *weyd- ‘to see’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*weyd-1‘to see’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*wéydos1‘seeing’reconstructed
  3. Proto-Hellenicc. 2200–1600 BCE*wéidos1reconstructed
  4. Ancient Greekc. 800–300 BCEεἶδος1eîdos
  5. Ancient Greekc. 800–300 BCEθῠρεοειδής1thŭreoeidḗs‘Shield-shaped’
  6. New Latinmodernthyreoīdēs1
  7. English1500–presentthyroid1
  8. Englishtodaythyro-1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English thyro-

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*weyd-Wiktionary, English thyro-‘to see’reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*wéydosWiktionary, English thyro-‘seeing’reconstructed
  3. Proto-Hellenicc. 2200–1600 BCE*wéidosWiktionary, English thyro-reconstructed
  4. Ancient Greekc. 800–300 BCEεἶδοςWiktionary, English thyro-eîdos
  5. Ancient Greekc. 800–300 BCEθῠρεοειδήςWiktionary, English thyro-thŭreoeidḗs‘Shield-shaped’
  6. New LatinmodernthyreoīdēsWiktionary, English thyro-
  7. English1500–presentthyroidWiktionary, English thyro-
  8. Englishtodaythyro-Wiktionary, English thyro-

Linked words

through Proto-Indo-European *weyd- ‘to see’

story, video, guy, idea, evidence, review, visit, provide, advice, interview, guide, vision, witness, historic, wisdom, visa, advise, invisible, evident, wit, wizard, historian, visibility, vista, wisely, witty, revise, guise, prudent, envious, jurisprudence, unwise, prudence, revue, druid, vide, avis, purview, improvise, twit, 106 more

through Proto-Indo-European *wéydos ‘seeing’

wise, 50 more

through Proto-Hellenic *wéidos

eidolon, steroidal, 50 more

through Ancient Greek εἶδος

idol, tabloid, steroid, idyll, trapezoid, colloid, sigmoid, hyoid, 52 more

through English thyroid

hypothyroidism, hyperthyroidism, parathyroid, 16 more

Today it means

prefix Thyroid.

Sources

Sources: Wiktionary, “thyro-”. 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 / Proto-Indo-European *weyd- / thyro-

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