The Collaborative International Dictionary
Galactometer
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.
Wiktionary
galactometer
n. (context archaic English) A lactometer.