Etymology

eka-

Today it means: Used to form prototype names for as-yet undiscovered elements, when prepended to the known element above them in the same group of the periodic table. Full definition →

Sanskrit एक (eka) ← Proto-Indo-Aryan *Háykas ← Proto-Indo-Iranian *Háykas
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The story

  1. Proto-Indo-European*ís?
  2. Proto-Indo-European*h₁óynos
  3. Proto-Indo-Iranian*Háykas
  4. Proto-Indo-Aryan*Háykas
  5. Sanskritएक (eka)
  6. English todayeka-

Borrowed from Sanskrit एक (eka, “one, first”).

Etymology from Wiktionary, CC BY-SA 4.0.