say it: mur-EENZ
marines is a noun meaning "an amphibious division of the United States Navy". It carries 2 recorded senses.
an amphibious division of the United States Navy
members of a body of troops trained to serve on land or at sea
military
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 marines 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.