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a stone structure like a fence around the edge of a balcony or other area higher than the ground
British a set of metal bars fixed over a hole in the ground that cows, sheep etc cannot cross. The American word is cattle guard.
a fence made of thin flat boards that are pointed at the top. People think of picket fences as typical of houses in small middle-class towns in the US.
a rainbow produced when water droplets in the air reflect light from the moon rather than the sunBuzzWord Article