Etymology

rickettsial

R1I1C3K5E1T1T1S1I1A1L1

Today it means: Relating to rickettsia. Full definition →

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

  1. Englishrickettsia
  2. Proto-Indo-European*h₂el-
  3. Proto-Indo-European*h₂élisder.?
  4. English todayrickettsial

From rickettsia + -al.

Etymology from Wiktionary, CC BY-SA 4.0.