The Metamorphosis is a short story by Franz Kafka; Metamorphoses is a series of tales by the Roman writer Ovid

The Metamorphoses
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Metamorphosis

A transformation, as by magic or sorcery.
A marked change in appearance, character, condition, or function.
Biology. A change in the form and often habits of an animal during normal development after the embryonic stage. Metamorphosis includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog.
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[Latin metamorphōsis, from Greek, from metamorphoun, to transform : meta-, meta- + morphē, form.]