·add. ·- A form of hydrometer for liquids heavier than water, graduated with an arbitrary scale such that the readings when multiplied by 0.005 and added to unity give the specific gravity.
·noun An instrument for determining the specific gravities of liquids, and thence the strength spiri...
Webster's Dictionary of the English Language
An instrument constructed to measure the specific gravities of fluids. That used at sea for testing ...
The Sailor's Word-Book