One of the mysteries of the English language finally explained.
Attributive Lying or taking place beneath a crust, especially (Geology) beneath the crust of the earth.
A layer that underlies a crust; specifically (a) Geology a (semi-molten) layer of rock beneath the earth's crust; (b) a supporting layer beneath the upper surface of a road.
Late 19th century. From sub- + crust.
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