Strong’s Greek
G1044 — gaggraina
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
γάγγραινα
gaggraina — pronounced gang'-grahee-nah
from graino (to gnaw); an ulcer ("gangrene"):--canker.
1 occurrence in the KJV.
2 Timothy 2:17
And their word will eat as doth a canker: of whom is Hymenaeus and Philetus;