noun
a tube or optical instrument with mirrors and lenses for viewing objects that are not in the direct line of sight
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The submarine captain used the periscope to scan the surface of the water for any potential threats.
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I love using the periscope on the boat to see what's happening around us.
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Check out this cool periscope on the ship, it's like having eyes underwater!
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His periscope-like ability to see through people's true intentions always amazed me.