ANIMAL — Definition of ANIMAL
noun
1
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).
A cat is an animal, not a plant. Humans are also animals, under the scientific definition, as we are not plants.
2
In non-scientific usage, any member of the kingdom Animalia other than a human.
3
In non-scientific usage, any land-living vertebrate (i.e. not fishes, insects, etc.).
4
A person who behaves wildly; a bestial, brutal, brutish, cruel, or inhuman person.
My students are animals.
📚 Source: en.wiktionary.org/wiki/animal
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