Dictionary

In scientific usage, a multicellular organism that is usually mobile, whose cells are not encased in a rigid cell wall (distinguishing it from plants and fungi) and which derives energy solely from the consumption of other organisms (distinguishing it from plants).

Example: A cat is an animal, not a plant. Humans are also animals, under the scientific definition, as we are not plants.

In non-scientific usage, any member of the kingdom Animalia other than a human.

In non-scientific usage, any land-living vertebrate (i.e. not fishes, insects, etc.).

A person who behaves wildly; a bestial, brutal, brutish, cruel, or inhuman person.

Example: My students are animals.

Of or relating to animals.

Example: animal instincts

Raw, base, unhindered by social codes.

Example: animal passions

Pertaining to the spirit or soul; relating to sensation or innervation.

Excellent