WordReference Random House Unabridged Dictionary of American English © 2026
ro•tam•e•ter
(rō tam′i tər, rō′tə mē′-),USA pronunciation n.
- Hydraulicsan instrument for measuring the rate of flow of a liquid, consisting of a tapered vertical tube in which a small float is forced upward until its weight balances the fluid force.
- partial translation of German Rotamesser (1911), equivalent. to Rota(tion) rotation + Messer measurer, meter