Tu·mor n.
 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.
 2. Affected pomp; bombast; swelling words or expressions; false magnificence or sublimity. [R.]
    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.
 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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 Fat·ty a. Containing fat, or having the qualities of fat; greasy; gross; as, a fatty substance.
 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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