lactometer
(lækˈtɒmɪtə(r))
[f. lacto- + -meter.]
An instrument for gauging the purity of milk.
| 1817 Blackw. Mag. II. 219 A Lactometer, for ascertaining the comparative value of each cow's milk in a dairy. 1872 Echo 8 Oct. 5 Milk which was proved by the lactometer to be more than half water. |