canker
Pronunciation:
/ˈkæŋkə//ˈkæŋkɚ/noun
Definitions
A plant disease marked by gradual decay.
A region of dead plant tissue caused by such a disease.
A worm or grub that destroys plant buds or leaves; cankerworm.
A corroding or sloughing ulcer; especially a spreading gangrenous ulcer or collection of ulcers in or about the mouth.