Etymology

labial

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Today it means: Of or pertaining to the lips or labia. Full definition →

Medieval Latin labiālis ← Proto-Indo-European *h₂élisder.? ← Latin labium
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The story

  1. Proto-Indo-European*leb-
  2. Proto-Indo-European*l̥b-yóm
  3. Proto-Italic*labjom
  4. Latinlabium
  5. Proto-Indo-European*h₂el-
  6. Proto-Indo-European*h₂élisder.?
  7. Medieval Latinlabiālis
  8. English todaylabial

Borrowing from Medieval Latin labiālis (“of or pertaining to the lips”), from labium (“a lip”) + -ālis (“-al”, adjectival suffix). By surface analysis, labi(um) + -al.

Etymology from Wiktionary, CC BY-SA 4.0.