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There are 8 thirteen-letter words beginning with REFR

REFRACTOMETER• refractometer n. (Physics) An optical instrument used to measure the refractive index of a substance.
• REFRACTOMETER n. an instrument for measuring the refraction of light.
REFRACTOMETRY• refractometry n. (Physics) the measurement of refractive index.
• REFRACTOMETRY n. measurement by refractometer.
REFRIGERATING• refrigerating v. Present participle of refrigerate.
• REFRIGERATE v. to make or keep cold.
REFRIGERATION• refrigeration n. The process of transferring heat from an object in order to cool it.
• refrigeration n. The process of preserving something by cooling.
• refrigeration n. (Medicine) The cooling of the body for therapeutic purposes.
REFRIGERATIVE• refrigerative adj. Cooling; allaying heat.
• refrigerative n. A refrigerant.
• REFRIGERATIVE adj. serving to refrigerate.
REFRIGERATORS• refrigerators n. Plural of refrigerator.
• REFRIGERATOR n. something that refrigerates.
REFRIGERATORY• refrigeratory n. (Dated) That which refrigerates or cools.
• refrigeratory adj. Mitigating heat; cooling.
• REFRIGERATORY adj. cooling; refrigerative.
REFRINGENCIES• refringencies n. Plural of refringency.
• REFRINGENCY n. refractivity, also REFRINGENCE.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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