Etymograph

English

heterofilament

Heterofilament comes from Latin fīlum ‘thread, string, filament, fiber’, and goes back to Proto-Indo-European *gʷʰiH-(s-)lo-.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*gʷʰiH-(s-)lo-1reconstructed
  2. Proto-Italicc. 1500–700 BCE*fī(s)lom1reconstructed
  3. Latinc. 75 BCE–200 CEfīlum1‘thread, string, filament, fiber’
  4. Late Latinmodernfīlō1
  5. Medieval Latinmodernfīlāmentum1
  6. English1500–presentfilament1
  7. Englishtodayheterofilament1

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, English heterofilament

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*gʷʰiH-(s-)lo-Wiktionary, English heterofilamentreconstructed
  2. Proto-Italicc. 1500–700 BCE*fī(s)lomWiktionary, English heterofilamentreconstructed
  3. Latinc. 75 BCE–200 CEfīlumWiktionary, English heterofilament‘thread, string, filament, fiber’
  4. Late LatinmodernfīlōWiktionary, English heterofilament
  5. Medieval LatinmodernfīlāmentumWiktionary, English heterofilament
  6. English1500–presentfilamentWiktionary, English heterofilament
  7. EnglishtodayheterofilamentWiktionary, English heterofilament

A compound of hetero- + filament

Proto-Indo-European *sem- ‘one, whole’

Proto-Indo-European *sḿ̥teros

Proto-Hellenic *hə́teros

Ancient Greek ἕτερος ‘other, another, different’

English hetero-

Proto-Indo-European *gʷʰiH-(s-)lo-

Proto-Italic *fī(s)lom

Latin fīlum ‘thread’

Late Latin fīlō ‘to spin, draw out in a long line’

Medieval Latin fīlāmentum

English filament

Linked words

through Proto-Italic *fī(s)lom

defile, 41 more

through Latin fīlum ‘thread, string, filament, fiber’

file, annihilation, nihilism, fillet, annihilate, nihilist, nihil, 43 more

through English filament

filamentous, 22 more

Today it means

noun A filament composed of two different materials (typically, one in the sheath and the other in the core)

Sources

Sources: Wiktionary, “heterofilament”. 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 *gʷʰiH-(s-)lo- / heterofilament

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