Etymograph

English

foil

Foil comes from Middle English foyle ‘a leaf’, and goes back to Proto-Italic *foljom.

  1. Proto-Italicc. 1500–700 BCE*foljom1reconstructed
  2. Classical Latinc. 75 BCE–200 CEfolium1‘a leaf’
  3. Late Latinc. 200–600 CEfolia2‘a leaf’
  4. Old Frenchc. 842–1400fueille2‘plant leaf’
  5. Middle Frenchc. 1400–1600fueille2
  6. Middle Englishc. 1150–1500foyle2‘a leaf’
  7. Englishearliest quotation a. 1587foil2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin folia
  2. 2 Wiktionary, English foil
  3. Earliest quotation in Wiktionary’s entry: a. 1587, Philippe Sidnei [i.e., (please specify the folio): “As she a black silk cap on him begun…”.

Earlier history uncertain. See Wiktionary.

Lineage

  1. Proto-Italicc. 1500–700 BCE*foljomWiktionary, Latin foliareconstructed
  2. Classical Latinc. 75 BCE–200 CEfoliumWiktionary, Latin folia‘a leaf’
  3. Late Latinc. 200–600 CEfoliaWiktionary, English foil‘a leaf’
  4. Old Frenchc. 842–1400fueilleWiktionary, English foil‘plant leaf’
  5. Middle Frenchc. 1400–1600fueilleWiktionary, English foil
  6. Middle Englishc. 1150–1500foyleWiktionary, English foil‘a leaf’
  7. Englishearliest quotation a. 1587foilWiktionary, English foil. Earliest quotation in Wiktionary’s entry: a. 1587, Philippe Sidnei [i.e., (please specify the folio): “As she a black silk cap on him begun…”

The story

The literary sense is from the practice of backing a gem with metal foil to make it shine more brilliantly.

Full etymology on Wiktionary

Linked words

through Proto-Indo-European *dʰelh₁- ‘to well forth, spring forth’

lue, thallium, thallus, 6 more

through Classical Latin folium ‘a leaf’

folio, folic, exfoliation, exfoliate, 21 more

through Old French fueille ‘plant leaf’

folly

Another origin of foil

  1. Proto-Indo-Europeanc. 4500–2500 BCE*bʰleh₃-‘to inflate, blow, swell’uncertain
  2. Latinc. 75 BCE–200 CEfullō‘to trample, full’
  3. Old Frenchc. 842–1400fouler‘tread on, trample’
  4. Middle Englishc. 1150–1500foilen‘spoil a scent trail by crossing it’
  5. Englishtodayfoil

Another origin of foil

  1. Frenchc. 1600–presentfoulis
  2. Englishtodayfoil

Today it means

noun A very thin sheet of metal.

Sources

Sources: Wiktionary, “foil”; the older steps come from the Wiktionary entry for Latin folia. 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-Italic *foljom / foil

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