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(noun) the smell of snow, snow's scent, the smell in the air when it is snowing/about to snow.

From the Latin word for snow, nix, put in possessive form, nivis, and the Latin word for smell, nidor.
Person 1: "What is that smell in the air?"
Person 2: "That is nivisnidor. It is going to snow."
by Miss Beatrice March 05, 2013