canker

柯林斯词典

1. N-COUNT A canker or canker sore is a small sore in the mouth or on the lips. (口或唇的)小溃疡[美国英语]
2. N-VAR Canker is a disease which affects the wood of shrubs and trees, making the outer layer come away to expose the inside of the stem. 树木溃疡病
In gardens, cankers are most prominent on apples and pear trees. 花园树木中患溃疡病最多的是苹果树和梨树。
3. N-COUNT A canker is something evil that spreads and affects things or people. 祸患; 毒瘤[正式]
...the canker of jealousy. ...嫉妒的毒瘤。