Breadcrumb Home > Thesaurus > P Synonyms of periscope Find synonyms for: Noun1. periscope, optical instrumentusage: an optical instrument that provides a view of an otherwise obstructed fieldWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of periscope (Dictionary) ✖ Related Content Daily Word Quiz: temporize Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language