abyssolith

noun

abys·​so·​lith

əˈbisəˌlith

plural -s

: a deep-seated igneous body lacking a floor of crystalline rock

abyssolithic

⸗¦⸗⸗¦⸗ik

adjective

Word History

Etymology

abyss + -o- + -lith

First Known Use

1913, in the meaning defined above

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