Etymology

filial

fil·i·al
F4I1L1I1A1L1

Today it means: Pertaining to or befitting a son or daughter. Full definition →

Middle English filial ← Latin fīliālis ← Proto-Indo-European *h₂élisder.?
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The story

  1. Proto-Indo-European*dʰeh₁(y)-
  2. Proto-Indo-European*dʰh₁ilyós
  3. Proto-Italic*θīlios
  4. Proto-Italic*fīlios
  5. Latinfīlius
  6. Proto-Indo-European*h₂el-
  7. Proto-Indo-European*h₂élisder.?
  8. Latinfīliālis
  9. Middle Englishfilial
  10. English todayfilial

From Middle English filial, from Latin fīliālis, from fīlius (“son”) / fīlia (“daughter”) + -al.

Etymology from Wiktionary, CC BY-SA 4.0.