French manomètre, from Greek manos sparse, loose, rare (akin to Armenian manr small) + French -mètre
circa 1730, in the meaning defined at sense 1
“Manometer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/manometer. Accessed 26 Nov. 2022.
Britannica.com: Encyclopedia article about manometer
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