Etymograph

English

stereodefect

Stereodefect comes from Latin dēficiō ‘to move away, leave, withdraw, break away’, from facio ‘to make, construct, fashion, frame, build, erect’, and ultimately from Proto-Indo-European *dʰeh₁k-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁k-1reconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁kyéti1reconstructed
  3. Proto-Italicc. 1500–700 BCE*θakjō1reconstructed
  4. Proto-Italicc. 1500–700 BCE*fakjō1‘to make’reconstructed
  5. Latinc. 75 BCE–200 CEfacio1‘to make, construct, fashion, frame, build, erect’
  6. Latinc. 75 BCE–200 CEdēficiō1‘to move away, leave, withdraw, break away’
  7. Latinc. 75 BCE–200 CEdēfectus1
  8. English1500–presentdefect1
  9. Englishtodaystereodefect1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English stereodefect

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*dʰeh₁k-Wiktionary, English stereodefectreconstructed
  2. Proto-Indo-Europeanc. 4500–2500 BCE*dʰh₁kyétiWiktionary, English stereodefectreconstructed
  3. Proto-Italicc. 1500–700 BCE*θakjōWiktionary, English stereodefectreconstructed
  4. Proto-Italicc. 1500–700 BCE*fakjōWiktionary, English stereodefect‘to make’reconstructed
  5. Latinc. 75 BCE–200 CEfacioWiktionary, English stereodefect‘to make, construct, fashion, frame, build, erect’
  6. Latinc. 75 BCE–200 CEdēficiōWiktionary, English stereodefect‘to move away, leave, withdraw, break away’
  7. Latinc. 75 BCE–200 CEdēfectusWiktionary, English stereodefect
  8. English1500–presentdefectWiktionary, English stereodefect
  9. EnglishtodaystereodefectWiktionary, English stereodefect

A compound of stereo- + defect

Proto-Indo-European *ster- ‘barren, infertile’

Ancient Greek στερεός ‘firm, solid’

English stereo-

Proto-Indo-European *dʰeh₁k-

…

Proto-Italic *fakjō ‘to make’

Latin facio ‘to make, construct, fashion, frame, build, erect’

Latin dēficiō ‘to be exhausted, run out, fail, run out, be…’

Latin dēfectus ‘a failure, lack’

English defect

Linked words

through Proto-Italic *θakjō

effectively, effectiveness, ineffective, affectionate, imperfection, putrefaction, 62 more

through Proto-Italic *fakjō ‘to make’

factor, effective, difficulty, interface, manufacture, faction, affection, perfection, facet, imperfect, affective, effector, deface, affectation, confectionary, 68 more

through Latin facio ‘to make, construct, fashion, frame, build, erect’

face, fact, difficult, profit, perfect, facility, feature, effect, faculty, affair, efficient, sacrifice, affect, facial, infection, facilitate, feat, efficacy, superficial, fetish, facade, counterfeit, facsimile, infect, hacienda, maleficent, aficionado, beautify, parfait, facies, efficacious, difficile, confit, confection, beneficent, refectory, 83 more

through Latin dēficiō ‘to move away, leave, withdraw, break away’

deficit, deficient, defection, defector, 7 more

Today it means

noun A heterotactic part of an otherwise isotactic polymer molecule

Sources

Sources: Wiktionary, “stereodefect”. 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 *dʰeh₁k- / stereodefect

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