14th century, in the meaning defined above
borrowed (with later spelling-pronunciation of s) from Anglo-French & Middle French abysme (compare Middle English abyme from Anglo-French abime, abisme), going back to Old French abysme, going back to Vulgar Latin *abismus, alteration of Late Latin abyssus abyss, perhaps via abíss(i)mus, alteration by haplology of abyssíssimus, a superlative derivative from abyssus
Synonyms for abysm
Words Related to abysm