[ suhb-kruhs-tl ]
/ sʌbˈkrʌs tl /

adjective Geology.

situated or occurring below the crust of the earth.

Origin of subcrustal

First recorded in 1895–1900; sub- + crustal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for subcrustal

  • It is perhaps from such a subcrustal layer that the lava of volcanoes is supplied.

    The Elements of Geology|William Harmon Norton