a container used for determining the density of a liquid or powder, having a specific volume and often provided with a thermometer to indicate the temperature of the contained substance.

1880–85; pycno- + -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pycnometer (pɪkˈnɒmɪtə)
a small glass bottle of known volume for determining the relative density of liquids and solids by weighing

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Place the lid on pycnometer and fasten it on a mechanical agitation device.
The pycnometer is then placed in a constant temperature bath and the volume of
  the weighed sample is determined.
The pycnometer was first filled with water and weighed.
Transfer the solution from the ampoule using a pycnometer or a pipet with
  dispenser handle.
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