Peephole

//ˈpiphoʊl// noun

Definitions

Noun
  1. 1
    A small hole, opening, or piece of glass, especially in a door, through which one can look without being seen.

    "It’s a conjurer’s den. — I shouldn’t be surprised if cabby’s old gent is staring at us all the while from some peephole of his own."

  2. 2
    a hole (in a door or an oven etc.) through which you can peep wordnet

Etymology

From peep + hole.

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