Source : Webster's Revised Unabridged Dictionary (1913)

Animal \An"i*mal\, n. [L., fr. anima breath, soul: cf. F.
   animal. See {Animate}.]
   1. An organized living being endowed with sensation and the
      power of voluntary motion, and also characterized by
      taking its food into an internal cavity or stomach for
      digestion; by giving carbonic acid to the air and taking
      oxygen in the process of respiration; and by increasing in
      motive power or active aggressive force with progress to
      maturity.

   2. One of the lower animals; a brute or beast, as
      distinguished from man; as, men and animals.

Animal \An"i*mal\, a. [Cf. F. animal.]
   1. Of or relating to animals; as, animal functions.

   2. Pertaining to the merely sentient part of a creature, as
      distinguished from the intellectual, rational, or
      spiritual part; as, the animal passions or appetites.

   3. Consisting of the flesh of animals; as, animal food.

   {Animal magnetism}. See {Magnetism} and {Mesmerism}.

   {Animal electricity}, the electricity developed in some
      animals, as the electric eel, torpedo, etc.

   {Animal flower} (Zo["o]l.), a name given to certain marine
      animals resembling a flower, as any species of actinia or
      sea anemone, and other Anthozoa, hydroids, starfishes,
      etc.

   {Animal heat} (Physiol.), the heat generated in the body of a
      living animal, by means of which the animal is kept at
      nearly a uniform temperature.

   {Animal spirits}. See under {Spirit}.

   {Animal kingdom}, the whole class of beings endowed with
      animal life. It embraces several subkingdoms, and under
      these there are Classes, Orders, Families, Genera,
      Species, and sometimes intermediate groupings, all in
      regular subordination, but variously arranged by different
      writers.

   Note: The following are the grand divisions, or subkingdoms,
         and the principal classes under them, generally
         recognized at the present time:

Source : WordNet®

animal
     adj 1: of the appetites and passions of the body; "animal
            instincts"; "carnal knowledge"; "fleshly desire"; "a
            sensual delight in eating"; "music is the only sensual
            pleasure without vice" [syn: {animal(a)}, {carnal}, {fleshly},
             {sensual}]
     2: of the nature of or characteristic of or derived from an
        animal or animals; "the animal kingdom"; "animal
        instincts"; "animal fats" [ant: {vegetable}, {mineral}]

animal
     n : a living organism characterized by voluntary movement [syn:
         {animate being}, {beast}, {brute}, {creature}, {fauna}]