Meaning of rhombochasm in English:

rhombochasm

Pronunciation /ˈrɒmbə(ʊ)ˌkaz(ə)m/

noun

Geology
  • A parallel-sided gap in the continental (sialic) crust occupied by basal (simatic) crust, formed when the curve in a fault-plane moves apart.

Origin

1950s. From rhombo- + chasm.