abyssolith

== English == === Etymology === From abyss (“deep”) +‎ -lith (“stone”). === Pronunciation === (US) IPA(key): /əˈbɪs.ə.lɪθ/ === Noun === abyssolith (plural abyssoliths) (geology) A mass of igneous rock deep in the crust with no known bottom; a large batholith. === References === Philip Babcock Gove (editor), Webster's Third International Dictionary of the English Language, Unabridged (G. & C. Merriam Co., 1976 [1909], →ISBN), page 9