microcosmic salt definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a white, crystalline salt, Na(NH)HPO·4HO, used as a reagent in blowpipe analysis because it forms characteristically colored compounds when fused with salts and oxides of metals
microcosmic salt definition by American Heritage Dictionary
A white crystalline salt of phosphorus, HNaNH4PO4·4H2O, used in blowpipe analysis of minerals to test for the presence of certain metals.