1. having no rays of light; dark or without illumination
2. lacking the petal-like structures around the center of a flower head
Usage: botanical

Examples

• The rayless dungeon offered no hope of natural light.
• We stumbled through the rayless corridor using only our flashlights.
• The rayless night made navigation extremely difficult.
• Some daisies are rayless, having only the central disc flowers.
• The botanist identified the rayless sunflower variety.
• In the rayless depths of the cave, we relied on our headlamps.