canker

柯林斯詞典

1. N-COUNT A canker or canker sore is a small sore in the mouth or on the lips. (口或脣的)小潰瘍[美國英語]
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. 樹木潰瘍病
In gardens, cankers are most prominent on apples and pear trees. 花園樹木中患潰瘍病最多的是蘋果樹和梨樹。
3. N-COUNT A canker is something evil that spreads and affects things or people. 禍患; 毒瘤[正式]
...the canker of jealousy. ...嫉妒的毒瘤。