metamorphosis

/ˌmɛtəˈmɔːfəsɪs,ˌmɛtəmɔːˈfəʊsɪs/

noun

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1. (in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages.

   "the persistence of the larval tail during metamorphosis"

   • a change of the form or nature of a thing or person into a completely different one.

     "her metamorphosis from aspiring unknown to internationally acclaimed author"