noun a deep valley with steep sides, often carved from the earth by a river
noun a hot spring that intermittently sends up fountain-like jets of water and steam into the air
noun a bioluminescent insect larva, especially of a beetle, that emits a soft greenish light
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noun a ridge of jagged rock, coral, or sand just above or below the surface of the sea
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noun a rainbow produced by moonlight rather than sunlight