Try Our Apps


Supposedly vs. Supposably


[hahy-drom-i-ter] /haɪˈdrɒm ɪ tər/
an instrument for determining the specific gravity of a liquid, commonly consisting of a graduated tube weighted to float upright in the liquid whose specific gravity is being measured.
Origin of hydrometer
1665-75; hydro-1 + -meter
Related forms
[hahy-druh-me-trik] /ˌhaɪ drəˈmɛ trɪk/ (Show IPA),
hydrometrical, adjective
hydrometry, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the Web for hydrometer
Historical Examples
British Dictionary definitions for hydrometer


an instrument for measuring the relative density of a liquid, usually consisting of a sealed graduated tube with a weighted bulb on one end, the relative density being indicated by the length of the unsubmerged stem
Derived Forms
hydrometric (ˌhaɪdrəʊˈmɛtrɪk), hydrometrical, adjective
hydrometrically, adverb
hydrometry, noun
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
Cite This Source
Word Origin and History for hydrometer

1670s, from hydro- + meter (n.3).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
hydrometer in Medicine

hydrometer hy·drom·e·ter (hī-drŏm'ĭ-tər)
An instrument used to determine specific gravity, especially a sealed graduated tube, weighted at one end, that sinks in a fluid to a depth indicating the fluid's specific gravity. Also called gravimeter.

hy'dro·met'ric (hī'drə-mět'rĭk) adj.
hy·drom'e·try n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
hydrometer in Science
An instrument used to measure the density of a liquid as compared to that of water. Hydrometers consist of a calibrated glass tube ending in a weighted glass sphere that makes the tube stand upright when placed in a liquid. The lower the density of the liquid, the deeper the tube sinks.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for hydrometer

Few English speakers likely know this word

Word Value for hydrometer

Scrabble Words With Friends

Nearby words for hydrometer