An immaterial but visible being that inhabited the air when the air was an element and before it was fatally polluted with factory smoke, sewer gas and similar products of civilization. Sylphs were allied to gnomes, nymphs and salamanders, which dwelt, respectively, in earth, water and fire, all now insalubrious. Sylphs, like fowls of the air, were male and female, to no purpose, apparently, for if they had progeny they must have nested in accessible places, none of the chicks having ever been seen.

An imaginary being inhabiting the air; a fairy.

an elemental being believed to inhabit the air

a wind spirit, which also happens to be my element

an "entity" or "elemental" that dwells in the plane of Air or is associated with the AIR Element.

Sylph is a faux-mythological creature in the Western tradition. The term originates in Paracelsus, who describes sylphs as invisible beings of the air, his elementals of air. There is no substantial mythos associated with them.