The Collaborative International Dictionary of English v.0.48:
Saccharimeter \Sac`cha*rim"e*ter\, n. [L. saccharon sugar +
-meter: cf. F. saccharim[`e]tre.]
An instrument for ascertaining the quantity of saccharine
matter in any solution, as the juice of a plant, or brewers'
and distillers' worts. [Written also saccharometer.]
Note: The common saccharimeter of the brewer is an hydrometer
adapted by its scale to point out the proportion of
saccharine matter in a solution of any specific
gravity. The polarizing saccharimeter of the chemist is
a complex optical apparatus, in which polarized light
is transmitted through the saccharine solution, and the
proportion of sugar indicated by the relative deviation
of the plane of polarization.