We found one dictionary that defines the word magmagenesis:

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1. magmagenesis: Wiktionary

Definitions from Wiktionary (magmagenesis) ▸ noun:  The formation of magma. ▸ Words similar to magmagenesis ▸ Usage examples for magmagenesis ▸ Idioms related to magmagenesis ▸ Wikipedia articles (New!) ▸ Popular adjectives describing magmagenesis ▸ Words that often appear near magmagenesis ▸ Rhymes of magmagenesis ▸ Invented words related to magmagenesis