The Collaborative International Dictionary
Stereometry
Stereometry \Ste`re*om"e*try\, n. [Stereo- + -metry: cf. F. st['e]r['e]om['e]trie.] The art of measuring and computing the cubical contents of bodies and figures; -- distinguished from planimetry.
Wiktionary
stereometry
n. (context now rare English) The science of measuring the volume of solids or solid bodies.