[1] : The Collaborative International Dictionary of English v.0.48

tumor \tu"mor\ t=u"m~er, n. l., fr. tumere to swell: cf.
   f. tume'ur. see tumid.
   1. med. a morbid swelling, prominence, or growth, on any
      part of the body; especially, a growth produced by
      deposition of new tissue; a neoplasm.
      1913 webster

   2. affected pomp; bombast; swelling words or expressions;
      false magnificence or sublimity. r.
      1913 webster

            better, however, to be a flippant, than, by a
            revolting form of tumor and perplexity, to lead men
            into habits of intellect such as result from the
            modern vice of english style.         --de quincey.
      1913 webster

   encysted tumor, a tumor which is inclosed in a membrane
      called a cyst, connected with the surrounding parts by the
      neighboring cellular substance.

   fatty tumor. see under fatty.

   innocent tumor, or benign tumor, one which does not of
      itself threaten life, and does not usually tend to recur
      after extirpation; a tumor which has not metastesized.

   malignant tumor, a tumor which tends continually to spread,
      to become generalized in different parts of the body, and
      to recur after extirpation, and which, if left to itself,
      causes death.
      1913 webster
see also:
tumid encysted tumor fatty tumor fatty innocent tumor benign tumor 
malignant tumor 

[2] : WordNet (r) 2.0

benign tumor
     n : a tumor that is not cancerous syn: benign tumour, nonmalignant
         tumor, nonmalignant tumour, nonmalignant neoplasm
see also:
benign tumour nonmalignant tumor nonmalignant tumour nonmalignant neoplasm 

Benign Tumor >> B Words
Benign Tumor, definition of term: Benign Tumor
benign+tumor_pag1.html

Benign >> B Words
Benign, definition of term: Benign
benign_pag1.html

Tumor >> T Words
Tumor, definition of term: Tumor
tumor_pag1.html

Brain Tumor >> B Words
Brain Tumor, definition of term: Brain Tumor
brain+tumor_pag1.html

Malignant Tumor >> M Words
Malignant Tumor, definition of term: Malignant Tumor
malignant+tumor_pag1.html