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beam a narrow ray of light. [1/5 definitions]
moonbeam a ray of light from the moon.
prism a solid glass or crystal object that light can pass through. It has three sides that are rectangles and two ends shaped like triangles. A prism splits a ray of light into the colors of the rainbow. [1/2 definitions]
ray1 A ray is a thin beam of light. [3 definitions]
shaft a straight beam or ray. [1/6 definitions]
stingray a broad, flat fish that has a long tail with a venomous spine on it. Stingrays are a kind of ray. Their tails can cause severe wounds.
sunbeam a ray or shaft of light from the sun.
X-ray An X-ray is a very strong, invisible beam of light that is able to pass through many kinds of solid material. These beams are very often used by doctors for seeing things inside the human body, like a person's bones. [3 definitions]