Etymology

Senonian

S1E1N1O1N1I1A1N1

Today it means: The final part of the Cretaceous epoch, comprising the Coniacian, Santonian, Campanian and possibly the Maastrichtian ages Full definition →

French sénonien ← Latin Senonēs
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The story

  1. Latin · derived fromSenonēs
  2. French · borrowed fromsénonien
  3. English todaySenonian

Borrowed from French sénonien, which was borrowed from Latin Senonēs.

Etymology from Wiktionary, CC BY-SA 4.0.