canker

• 指树木或植物因真菌感染而形成的溃疡、腐烂病；也指口腔或嘴唇上的溃疡；还比喻难以根除的有害影响或腐败。

A noun referring to a destructive fungal disease affecting woody plants, an ulceration of the mouth or lips, or a pervasive and harmful influence that is difficult to eradicate.

1. Plant diseaseC1formalscientific

   A fungal infection affecting woody plants, resulting in localized damage to the bark and underlying tissues.

   溃疡病

   • The apple tree was infected with canker, causing the bark to crack and peel.
   • Gardeners must prune away branches affected by canker to prevent its spread.
   • The disease canker can weaken a tree significantly over time.

2. Mouth ulcerB2formalmedical

   A painful sore or ulceration that appears on the lips or inside the mouth.

   口腔溃疡

   • She developed a canker on her lip after biting it accidentally.
   • Canker sores can make eating and speaking uncomfortable.
   • The dentist prescribed a gel to treat the canker in his mouth.

   同义词aphthous ulcercanker sore

3. Harmful influenceC2formal

   A destructive or corrupting influence that is difficult to eliminate and spreads gradually.

   有害影响

   • Corruption is a canker that eats away at the foundations of society.
   • The spread of misinformation is a canker on public discourse.
   • They saw the new policy as a canker that would undermine the organization's values.

   同义词blightcancercontagioncorruptioncurseevilmalignancypestilenceplaguescourge

• 过时用法，指像溃疡或锈蚀那样侵蚀、腐化、败坏，或使某物受到感染、变得腐败。

An obsolete verb meaning to infect or corrupt, or to become infected or corrupted, like a canker sore or rust.

1. Become infected with a cankerC1formalmedical

   To develop a destructive, ulcerous sore or infection, typically in plant or animal tissue.

   溃烂

   • The tree began to canker after the harsh winter.
   • If left untreated, the wound may canker and spread.
   • The rose bush started to canker due to the fungal infection.

   同义词festersuppurateulcerate

2. Infect with a cankerC1formalmedical

   To cause an infection characterized by ulcerous sores or decay.

   使生溃疡

   • The disease can canker the leaves of the plant.
   • Poor hygiene can canker the gums over time.
   • The parasite can canker the flesh of the host.

   同义词blightcorrodedecayfesterinfectulcerate