ADJECTIVE (2)

1. relating to or affected with cancer;
- Example: "a cancerous growth"

2. like a cancer; an evil that grows and spreads;
- Example: "remorse was cancerous within him"
- Example: "pornography is cancerous to the moral development of our children"

The Collaborative International Dictionary of English v.0.48:

cancerous \can"cer*ous\, a. [Cf. F. canc['e]reux]
   Like a cancer; having the qualities or virulence of a cancer;
   affected with cancer; as, a cancerous growth. "cancerous
   vices" --G. Eliot.
   [1913 Webster] -- Can"cer*ous*ly, adv. --
   Can"cer*ous*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cancerous
    adj 1: relating to or affected with cancer; "a cancerous growth"
    2: like a cancer; an evil that grows and spreads; "remorse was
       cancerous within him"; "pornography is cancerous to the moral
       development of our children"