Definition of porterhouse in English:

porterhouse

noun

North American
historical
  • An establishment at which porter and sometimes steaks were served.

    • ‘A five story brick building at the corner Mercer and Prince Street was typical, with a porterhouse in its storefront and an expensive brothel upstairs.’
    • ‘Around 1814, this steak was served at a New York porterhouse and soon achieved national popularity.’

Origin

Mid 18th century: from porter (sense 2)+ house.

Pronunciation

porterhouse

/ˈpɔːtəhaʊs/