periscope
Other forms: periscopes
A periscope is a tool you use to see things that would otherwise be hidden or obstructed. If you've ever been stuck in a submarine, curious about what's going on above water, then you've needed a periscope.
You may have heard -scope used with other words that have to do with seeing things, as it means "a viewing instrument." You use a telescope to look at stars and a microscope to look at teeny, tiny cells. A periscope is a tool that helps you see around what is an otherwise blocked view. It's often shaped like an "L" and can help you keep an eye on when your teacher will be rounding the corner!
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an optical instrument that provides a view of an otherwise obstructed fieldtype of:optical instrumentan instrument designed to aid vision
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Vocabulary lists containing periscope
Have a close look at this list of words that include the suffix -scope, meaning "an instrument for observing." The Latinized scopium derives from the Greek skopein, "to look, to examine."
Words from Round 2 of the 2015 Scripps National Spelling Bee. Full list is here.
Make the rounds with these lists of prefixes that all have to do with things that go around: circum, ambi, peri