Tumor \Tu"mor\ (t[=u]"m[~e]r), n. [L., fr. tumere to swell: cf.
   F. tume['u]r. 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.
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   2. Affected pomp; bombast; swelling words or expressions;
      false magnificence or sublimity. [R.]
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            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.
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   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.
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Fatty \Fat"ty\, a.
   Containing fat, or having the qualities of fat; greasy;
   gross; as, a fatty substance.
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   Fatty acid (Chem.), any one of the paraffin series of
      monocarbonic acids, as formic acid, acetic, etc.; -- so
      called because the higher members, as stearic and palmitic
      acids, occur in the natural fats, and are themselves
      fatlike substances.

   Fatty clays. See under Clay.

   Fatty degeneration (Med.), a diseased condition, in which
      the oil globules, naturally present in certain organs, are
      so multiplied as gradually to destroy and replace the
      efficient parts of these organs.

   Fatty heart, Fatty liver, etc. (Med.), a heart, liver,
      etc., which have been the subjects of fatty degeneration
      or infiltration.

   Fatty infiltration (Med.), a condition in which there is an
      excessive accumulation of fat in an organ, without
      destruction of any essential parts of the latter.

   Fatty tumor (Med.), a tumor consisting of fatty or adipose
      tissue; lipoma.
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