Definition

Noun: 1. An optical instrument that provides a view of an otherwise obstructed field: A device using mirrors or prisms arranged in a tube to allow an observer to see over, around, or through an obstacle, commonly used in submarines to view the surface from underwater.

Usage Examples

• Noun:
  • The submarine captain raised the periscope to scan the horizon for enemy ships.
  • During the parade, the child used a homemade periscope to see over the crowd.
  • The tank's commander viewed the battlefield through the vehicle's periscope.

Advanced Usage

• "to go to periscope depth": A naval term for when a submarine ascends to a shallow depth where it can safely extend its periscope above the water's surface.
  • The submarine went to periscope depth to receive radio communications.

Variants and Related Words

• Periscopic (adj): Relating to or having the characteristics of a periscope; providing a wide or all-around view.
  • The vehicle had periscopic vision blocks for the driver.

Synonyms

• Viewing device: A general term for an instrument used for observation.
• Sight: An apparatus for aiming or observing (though less specific).

Related Phrases

• Periscope rifle: A rifle fitted with a periscope, allowing a soldier to aim and fire from behind cover without exposing themselves.
  • Trenches in World War I sometimes saw the use of periscope rifles.

Related Idioms

(No common idioms are directly based on the word "periscope".)

Noun

1. an optical instrument that provides a view of an otherwise obstructed field