relative density definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
See specific gravity.
relative density - Science Definition
The ratio of the density of one substance to that of a reference substance, typically water. See more at specific gravity.