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Children's Dictionary
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]
shaft a straight beam or ray. [1/6 definitions]
stingray a broad, flat fish that has a long tail with a poisonous spine on it. Stingrays are a kind of ray. Their tails can cause severe wounds.