a cell containing two electrolytes that have different specific gravities.
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British Dictionary definitions for gravity cell
an electrolytic cell in which the electrodes lie in two different electrolytes, which are separated into two layers by the difference in their relative densities
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012