The Collaborative International Dictionary
Lactobutyrometer
Lactobutyrometer \Lac`to*bu`ty*rom"e*ter\, n. [L. lac, lactis, milk + E. butyrometer.] An instrument for determining the amount of butter fat contained in a given sample of milk.
Wiktionary
lactobutyrometer
n. An instrument for determining the amount of butterfat in milk.