abyssolith

noun

noun

US /əˈbɪs.ə.lɪθ/

Etymology From abyss (“deep”) + -lith (“stone”).

Geography, Geology, Natural sciences A mass of igneous rock deep in the crust with no known bottom; a large batholith.

An abyssolith, then, is a mass of rock, generally granite or one of the more basic rocks of this type...1920, Amadeus William Grabau, A Textbook of Geology: General Geology:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.