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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 of eka-
< Sanskrit eka one Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • eka waiting waist-deep in the snow for the Founder to instruct him.

    Zen Buddhism Arthur Waley
eka in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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