Definition of rheomorphism in US English:

rheomorphism

noun

  • Geology. The process by which a rock becomes plastic, usually as a result of partial melting and the addition by diffusion of extraneous magmatic material.

Origin

1930s (in an earlier sense). From rheo- + -morphism.

Pronunciation

rheomorphism

/ˌriːə(ʊ)ˈmɔːfɪz(ə)m/