- The weight in grams of an ion that is equal to the sum of the atomic weights of the atoms making up the ion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for gram-ion
In such a solution, the concentration of silver-ion is reduced to 8E24 gram-ion per liter.