1
: any of a kingdom (Animalia) of living things including many-celled organisms and often many of the single-celled ones (such as protozoans) that typically differ from plants in having cells without cellulose walls, in lacking chlorophyll and the capacity for photosynthesis, in requiring more complex food materials (such as proteins), in being organized to a greater degree of complexity, and in having the capacity for spontaneous movement and rapid motor responses to stimulation
2
a
: one of the lower animals (see lower entry 3 sense 3) as distinguished from human beings
b
: mammal
broadly
: vertebrate
3
: a human being considered chiefly as physical or nonrational
also
: this nature
4
: a person with a particular interest or aptitude
a political animal
He's a party animal.
5
: matter, thing
the theater … is an entirely different animal—Arthur Miller
also
: creature sense 1c
1
: of, relating to, resembling, or derived from animals
animal instincts
animal behavior
2
3
: of or relating to the animal pole of an egg or to the part from which ectoderm normally develops
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Merriam-Webster unabridged
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