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say it: pahn-TOON
pontoon is a noun meaning "(nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge". It carries 2 recorded senses.
(nautical) a floating structure (as a flat-bottomed boat) that serves as a dock or to support a bridge
boat
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for pontoon come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.