EKA

eka-

Chemistry.
a prefix used to designate the first element of the same family in the periodic table beyond the one to whose name it is prefixed, as ekaselenium for technetium.

Origin:
< Sanskrit eka one

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American Heritage
Medical Dictionary

eka- pref.
One or first, used especially to name undiscovered elements of the periodic table whose characteristics have been postulated: eka-osmium.

The American Heritage® Stedman's Medical Dictionary
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