Breadcrumb Home > Thesaurus > P Synonyms of periscope Find synonyms for: Noun 1. periscope, optical instrument usage: an optical instrument that provides a view of an otherwise obstructed field WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of periscope (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language