- The definition of a pycnometer is a tool used to measure the weight or density of a liquid.
An example of a pycnometer is a scientist's way of figuring out the weight of water.
a vessel of a precise volume used to measure the density of liquids or solids
Origin of pycnometerpycno- + -meter
A standard vessel used in measuring the density or specific gravity of materials.
Origin of pycnometerGreek puknos, dense + –meter.
From the Greek: πυκνός (puknos) meaning dense