LATIN DICTIONARYLexicon Latīnum
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“abyss” in Latin

The English word abyss itself goes back to Latin abyssus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

abyss
infinita or immensa altitudo: vorago (abyss; chasm): gurges (whirlpool): barathrum (is a poetical expression): profundum (with or without maris; abyss of the sea).
Figuratively, manifest overwhelming danger; vorago; pestis, pernicies. To plunge into an abyss of danger, ad pestem ante oculos positam proficisci; in praeceps ruere.

Quick answer

What is the Latin word for abyss?
The usual Latin words for “abyss” are īnfīnītus, vorāgō, gurges; also barathrum, profundus, pestis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.