Definition of Moho
: the boundary layer between the earth's crust and mantle whose depth varies from about 3 miles (5 kilometers) beneath the ocean floor to about 25 miles (40 kilometers) beneath the continents
From the M-W Editors
Origin and Etymology of moho
short for Mohorovicic discontinuity, from Andrija Mohorovičić †1936 Yugoslavian geologist
First Known Use: 1952
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