Definition of "refractometer" []

• Any of several instruments used to measure the index of refraction of a substance. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Nonetheless, the refractometer is a great tool, and I'm thinking about getting one."
• "In order to determine the harvest date, both the vineyard manager and the winemaker take many samples a day from throughout the vineyard: He will pick a berry and put it in a device called the refractometer, which tells the sugar levels."
• "A refractometer, which is a telescope-looking contraption that uses a speck of the fruit's juice to measure the Brix."