effervescent salt

[ ĕf′ər-vĕsənt ]

n.

Any of the preparations made by adding sodium bicarbonate and tartaric and citric acids to a medicinally active salt.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.