Hydrometer

Chamber's Twientieth Century Dictionary · 1908 · p. 51

hī-drom′et-ėr, n. an instrument for measuring the density or specific gravity of solids and liquids by flotation, consisting of a weighted gla bulb or hollow metal cylinder with a long stem: a current-gauge.— adjs. Hydromet′ric , -al .— n. Hydrom′etry . [Gr. hydōr , water, metron , a measure.]