met·a·mor·phose / ˌmetəˈmôrˌfōz; -ˌfōs/ • v. [intr.] (of an insect or amphibian) undergo metamorphosis, esp. into the adult form: feed the larvae to your fish before they metamorphose into adults. ∎ change completely in form or nature: a father seeing his daughter metamorphosing from girl into woman. ∎ [tr.] cause (something) to change completely. ∎ [tr.] Geol. subject (rock) to metamorphism: [as adj.] (metamorphosed) a metamorphosed sandstone.