Both Uses

abyss
in
MS. Found in a Bottle
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We were at the bottom of one of these abysses, when a quick scream from my companion broke fearfully upon the night.†
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abysses = holes or dropoffs so deep the bottom cannot be seen -- often used figuratively to imply frightening bottomless pits
We are surely doomed to hover continually upon the brink of Eternity, without taking a final plunge into the abyss.†

abyss = a hole or dropoff so deep the bottom cannot be seen -- often used figuratively to imply a frightening bottomless pit

Definitions:

(1) (abyss)
a hole or dropoff so deep the bottom cannot be seen -- often used figuratively to imply a frightening bottomless pit
(2) (meaning too rare to warrant focus)