Definition of migma in US English:

migma

noun

Geology
  • A mixture of solid and molten rock.

Origin

1940s. From German Migma from ancient Greek μιγματ-, μίγμα mixture from the stem of μιγνύναι to mix + -μα; probably adopted by Reinhard after German Magma.

Pronunciation

migma

/ˈmɪɡmə/