Definitions from Wiktionary ( )

▸ noun:  (phytopathology)
▸ noun:  A diseased condition suffered by a plant; specifically, a complete and rapid chlorosis, browning, then death of plant tissues such as floral organs, leaves, branches, or twigs, especially one caused by a fungus; a mildew, a rust, a smut.
▸ noun:  The cause of such a condition, often unseen but believed to be airborne; specifically, a bacterium, a virus, or (especially) a fungus; also, an aphid which attacks fruit trees.
▸ noun:  (by extension)
▸ noun:  A state of cloudy, humid weather.
▸ noun:  (pathology, dated) A diseased condition of the face or skin; specifically, bleeding under the conjunctiva of the eye, a form of skin rash, or a palsy of the face due to cold.
▸ noun:  (figurative)
▸ noun:  Something that impedes development or growth, or spoils any other aspect of life.
▸ noun:  (specifically) A rundown and unsightly condition of an urban area; also, such an area.
▸ verb:  (transitive)
▸ verb:  (phytopathology) To affect the fertility or growth of (a plant) with a blight (noun sense 1.1), especially one caused by a fungus; to blast, to mildew, to smut.
▸ verb:  (by extension, pathology, dated) To affect (a body part) with a disease.
▸ verb:  (figurative) To impede the development or growth of (an aspect of life); to damage, to ruin, to spoil.
▸ verb:  (intransitive) Of a plant: to suffer blight (noun sense 1.1).

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