'Volumeter' definitions:

Definition of 'volumeter'

noun

A meter to measure the volume of gases, liquids, or solids (either directly or by displacement)

From: GCIDE

Volumeter \Vo*lu"me*ter\, n. [Cf. F. volum[`e]tre. See Volumetric.] (Physics) An instrument for measuring the volumes of gases or liquids by introducing them into a vessel of known capacity. [1913 Webster]