abyssal rock

• (Received Pronunciation) IPA^(key): /əˈbɪs.l̩ ɹɒk/
• (US) IPA^(key): /əˈbɪs.l̩ ɹɑk/

abyssal rock (plural abyssal rocks)

1. (geology) An igneous rock that crystallized at considerable depth in the crust; plutonic rock.

• Philip Babcock Gove (editor), Webster's Third International Dictionary of the English Language, Unabridged (G. & C. Merriam Co., 1976 [1909], →ISBN), page 9