[noun] [C] [specialized or formal] - a disease which attacks the wood of trees, or the mouths and ears of animals and people(specialized or formal) A canker is also something evil that spreads through a person's mind, an organization or a society.Poverty is a canker eating away at the heart of society.
CANKER
Meaning of CANKER in English
Cambridge English vocab. Кембриджский английский словарь. 2012