Polarograph

[ poh-lar-uh-graf, -grahf, puh- ]
/ poʊˈlær əˌgræf, -ˌgrɑf, pə- /

Trademark.

a brand name for an instrument that automatically registers the current in electrolysis at a dropping mercury electrode.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020