abyssopelagic

• abyssalpelagic

From abyss (“abyss”) +‎ pelagic (“open ocean”).

• (US) IPA^(key): /əˌbɪs.oʊ.pəˈlæ.d͡ʒɪk/
• Rhymes: -ædʒɪk

abyssopelagic (not comparable)

1. Of or pertaining to the depths of the ocean; of the open waters of the abyssal zone.

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