Etymology

archaebacterial

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Today it means: Of or pertaining to bacteria of the domain Archaea, formerly classified as Archaebacteria Full definition →

Proto-Indo-European *h₂élisder.? ← English archaebacteria
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The story

  1. Englisharchaebacteria
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayarchaebacterial

From archaebacteria + -al.

Etymology from Wiktionary, CC BY-SA 4.0.