refractometer

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re·frac·tom·e·ter / riˌfrakˈtämətər; rē-/ • n. an instrument for measuring a refractive index.DERIVATIVES: re·frac·to·met·ric / riˌfraktəˈmetrik; ˌrē-/ adj.re·frac·tom·e·try / -trē/ n.

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