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The Collaborative International Dictionary
Operameter

Operameter \Op`er*am"e*ter\, n. [L. opus, operis, pl. opera work + -meter.] An instrument or machine for measuring work done, especially for ascertaining the number of rotations made by a machine or wheel in manufacturing cloth; a counter.
--Ure.

Wiktionary
operameter

n. (context archaic English) An instrument or machine for measuring work done, especially the number of rotations by a machine or wheel in manufacturing cloth.