Definition of cancer bush in US English:

cancer bush

noun

South African
  • Any of several plants of the South African genus Sutherlandia (family Fabaceae (Leguminosae)), purported to have beneficial effects for cancer sufferers; especially S. frutescens, now also used to treat HIV and AIDS.

Origin

Late 19th century. After Afrikaans kankerbos (earlier in South African Dutch as kankerbosch).