a tube containing mirrors, through which a person can look in order to see things which cannot be seen from the position the person is in, especially one used in submarines when under water to allow a person to see what is happening on the surface of the sea.
periscoop
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Vraag professionele hulp bij het schrijven van zakelijke, academische of persoonlijke teksten in het Engels door native speakers.

periscope

periscoop

Bron: Wakefield genealogy pages