used to form prototype names for as-yet undiscovered elements.

listen to the pronunciation of used to form prototype names for as-yet undiscovered elements.
Английский Язык - Английский Язык

Определение used to form prototype names for as-yet undiscovered elements. в Английский Язык Английский Язык словарь

used to form prototype names for as-yet undiscovered elements.
eka-