Blight, n. 1. Mildew; decay; anything nipping or blasting; — applied as a general name to various injuries or diseases of plants, causing the whole or a part to wither, whether occasioned by insects, fungi, or atmospheric influences.
2. The act of blighting, or the state of being blighted; a withering or mildewing, or a stoppage of growth in the whole or a part of a plant, etc.
3. That which frustrates one's plans or withers one's hopes; that which impairs or destroys.
A blight seemed to have fallen over our fortunes.
Disraeli.
4. (Zoöl.) A downy species of aphis, or plant louse, destructive to fruit trees, infesting both the roots and branches; — also applied to several other injurious insects.
5. pl. A rashlike eruption on the human skin.