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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.