Sillage

Sillage is a noun that refers to a scent that lingers in the air.  Sillage comes directly from French where it means ‘trail,’ but unlike ‘trail’ which has a broader meaning, our word of the day almost always refers to a scent.  Finding my old lucky horseshoe in the basement wasn’t difficult. I just had to follow that unmistakable sillage of rusted metal.