Boswash: Meaning and Definition of

Bos•wash

Pronunciation: (bôs'wosh", -wôsh", bos'-), [key]
— n. Informal.
  1. the heavily populated area extending from Boston to Washington and including New York City, Philadelphia, and Baltimore.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.