a·byss (?-b?s?)n.1. An immeasurably deep chasm, depth, or void: “lost in the vast abysses of space and time” (Loren Eiseley).2. a. In the book of Genesis, the primeval Chaos out of which earth and sky were formed.b. The abode of evil spirits; hell.[Middle English abissus, from Late Latin abyssus, from Greek abussos, bottomless : a-, without; see a-1 + bussos, bottom.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.abyss (??b?s) n1. (Physical Geography) a very deep or unfathomable gorge or chasm2. anything that appears to be endless or immeasurably deep, such as time, despair, or shame3. (Theology) hell or the infernal regions conceived of as a bottomless pit[C16: via Late Latin from Greek abussos bottomless (as in the phrase abussos limn? bottomless lake), from a-1 + bussos depth]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014a?byss (??b?s) n. 1. a deep, immeasurable space, gulf, or cavity; vast chasm. 2. the lowest or most hopeless depths. 3. (in ancient cosmogony) the infernal regions; hell. [1350?1400; earlier abisse, Middle English abissus