Mohorovičić discontinuity

[moh-haw-roh-vuh-chich, -hoh-]
noun Geology.
the discontinuity between the crust and the mantle of the earth, occurring at depths that average about 22 miles (35 km) beneath the continents and about 6 miles (10 km) beneath the ocean floor.
Also, Moho.

1935–40; named after Andrija Mohorovičić (1857–1936), Croatian geophysicist, who discovered it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Mohorovičić discontinuity (ˌməʊhəˈrəʊvɪtʃɪtʃ)
Often shortened to: Moho the boundary between the earth's crust and mantle, across which there is a sudden change in the velocity of seismic waves
[C20: named after Andrija Mohorovičić (1857--1936), Croatian geologist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
Mohorovičić discontinuity   (mō'hə-rō'və-chĭch)  Pronunciation Key 
The boundary between the Earth's crust and mantle, located at an average depth of 8 km (5 mi) under the oceans and 32 km (20 mi) under the continents. The velocity of seismic primary waves across this boundary changes abruptly from 6.7 to 7.2 km (4.1 to 4.5 mi) per second in the lower crust to 7.6 to 8.6 km (4.7 to 5.3 mi) per second in the upper mantle. The boundary is estimated to be between 0.2 and 3 km (0.1 and 1.9 mi) thick and is believed to coincide with a change in rock type from basalts (above) to peridotites and dunites (below). It is named after its discoverer, Croatian seismologist Andrija Mohorovičić (1857-1936).
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