1.[Disease]a disease of animals, e.g. a disease of horses that makes their hooves spongy, a disease that can cause ulcers in the outer ears of some animals, or a throat infection of some birds
2.[Plant Disease]a disease that creates open wounds on the trunks and branches of woody plants; it can be caused by bacteria, fungi, or pests
3.an evil or corrupting influence that spreads and is difficult to wipe out
4.[Insect]an insect larva which attacks plants