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- n. A noun case used to express means or agency—and is generally indicated in English by by or with with the objective. Languages that use the instrumental case include Armenian, Serbo-Croatian, Czech, Dyirbal, Georgian, Slovene, Polish, Quechua, Russian and Sanskrit.
Sorry, no etymologies found.
"It is however unfortunate," the newt continued modestly, "that there is no-one here with whom I am able to speak Czech, and I am even uncertain as to whether the word for 'horse' in the instrumental case is 'koni' or 'koňmi'."