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-
From the Sanskrit word eka one
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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.