Entry 3 senses Webster, 1913 Abyss /ə-bĭs'/ · A·byss · IPA /əˈbɪs/ 01 n. A bottomless or unfathomed depth, gulf, or chasm; hence, any deep, immeasurable, and, specifically, hell, or the bottomless pit. 1. A bottomless or unfathomed depth, gulf, or chasm; hence, any deep, immeasurable, and, specifically, hell, or the bottomless pit. “Ye powers and spirits of this nethermost abyss.” — Milton. “The throne is darkness, in the abyss of light.” — Dryden. 2. Infinite time; a vast intellectual or moral depth. “The abysses of metaphysical theology.” — Macaulay. “In unfathomable abysses of disgrace.” — Burke. 3. The center of an escutcheon.(Her.)