Definition of hydrometer
: an instrument for determining the specific gravity of a liquid (such as battery acid or an alcohol solution) and hence its strength
hydrometricplay \ˌhī-drə-ˈme-trik\ adjective
First Known Use of hydrometer
Seen and Heard
What made you want to look up hydrometer? Please tell us where you read or heard it (including the quote, if possible).