canker
n
1 [U] disease that destroys the wood of plants and trees (植物的)溃疡病.
2 [U] disease causing ulcerous sores on the ears of animals, esp dogs and cats (动物耳部的)溃疡(尤指猫狗).
3 [C] (fig 比喻) evil or dangerous influence that spreads and corrupts people (蔓延并腐蚀人们的)祸害, 祸患, 祸根
Drug addiction is a dangerous canker in society. 吸毒成瘾是腐蚀社会的一大祸害. Cf 参看 cancer 2. canker, v [Tn]
infect or corrupt (sb) with canker 使(某人)患溃疡; 腐蚀(某人).