say it: BAWL-tuh-mawr
baltimore is a noun meaning "the largest city in Maryland; a major seaport and industrial center". It carries one recorded sense.
the largest city in Maryland; a major seaport and industrial center
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 baltimore 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.