Definition of "rayless" [ray•less]

• Lacking rays: a rayless flower. (adjective)
• Lacking light: "Hid by a rayless night” ( Percy Bysshe Shelley). (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A few, however, throw off only b-particles, while some are "rayless", i.e. undergo transformation without the expulsion of high-speed"
• "Possessed of more than a cursory knowledge of astronomy, he took a sick man's pleasure in speculating as to the dwellers on the unseen worlds of those incredibly remote suns, to haunt whose houses of light, life came forth, a shy visitant, from the rayless crypts of matter."
• "Next, the Vision! next the Morning, after rayless nights and days,"