"moho" in the noun sense
1. Mohorovicic discontinuity, Moho
the boundary between the Earth's crust and the underlying mantle
"the Mohorovicic discontinuity averages 5 miles down under oceans and 20 miles down under continents"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License