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The Collaborative International Dictionary of English v.0.48 (gcide)

Fatty \Fat"ty\, a.
Containing fat, or having the qualities of fat; greasy;
gross; as, a fatty substance.
[1913 Webster]

{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.
[1913 Webster]