English Reference
noun

metamorphosis

n.
US /ˌmɛtəˈmɔɹfəsəs/ UK /mˌɛtəmˈɔːfəsˌɪs/ meta·mor·pho·sis

  1. 01 C1 Advanced Technical Science

    the process where an animal's body changes completely as it grows, such as a tadpole becoming a frog.

    the biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure.

    Simple

    The children watched the metamorphosis of the caterpillars into beautiful monarch butterflies.

    In context

    In many insect species, metamorphosis involves a complete pupal stage where the larval tissues are entirely reorganised into adult structures.

    Usage

    Often used with the preposition 'of' to describe the subject and 'into' to describe the result.

  2. 02 C1 Advanced AcademicLiterary

    a major change in the appearance, character, or circumstances of a person or thing.

    a marked change in appearance, character, condition, or function within a non-biological context.

    Simple

    After his year abroad, he underwent a complete metamorphosis and became much more confident.

    In context

    The city has undergone a stunning metamorphosis from a decaying industrial hub into a vibrant centre for technology and the arts.

  3. 03 C2 Proficiency Literary

    a change in form brought about by magic or supernatural power.

    a transformation of a person or object into a different shape or entity through supernatural or mythological means.

    Simple

    In the old myths, the goddess caused the hunter's metamorphosis into a deer.

    In context

    Ovid's famous poem explores various myths of metamorphosis, where humans are transformed into animals or plants by the whims of the gods.

    transmutationshapeshifting

For decades, scientists widely assumed that tetrapods managed this shift through metamorphosis—beginning as waterborne tadpoles, much like modern frogs, then reorganizing their entire body plan to become partially land-dwelling adults.

Smithsonian Magazine· 18 Jun 2026

First attested in 1533, from Latin metamorphōsis, from Ancient Greek μεταμόρφωσις (metamórphōsis), from μετά (metá, “change”) + μορφή (morphḗ, “form”). Analyzable as meta- + -morph + -osis

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Ancient Greek μεταμόρφωσις
Level C1 · Advanced
Frequency Occasional
Updated