Abyss

Part of speech: noun (n.)

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.