[ fawr-tan; French fawr-tan ]
/ ˈfɔr tæn; French fɔrˈtɛ̃ /
an adjustable cistern barometer, the most common of those employing mercury.
Origin of Fortin barometer
1870–75; named after J. Fortin (1750–1831), French physicist who invented it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020