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From The Collaborative International Dictionary of English v.0.48:
Galactometer \Gal`ac*tom"e*ter\, n. [Gr. ?, ?, milk + -meter: cf. F. galactom[`e]tre. Cf. Lactometer.] An instrument for ascertaining the quality of milk (i.e., its richness in cream) by determining its specific gravity; a lactometer. [1913 Webster]