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The Collaborative International Dictionary
Mesolabe

Mesolabe \Mes"o*labe\, n. [L. mesolabium, Gr. ?; me`sos middle + ? to take.] An instrument of the ancients for finding two mean proportionals between two given lines, required in solving the problem of the duplication of the cube.
--Brande & C.

Wiktionary
mesolabe

n. An ancient instrument for finding two mean proportionals between two given lines, required in solving the problem of the duplication of the cube.