a person who dines.

a railroad dining car.

a restaurant built like such a car.

a small, informal, and usually inexpensive restaurant.

noun

automat , bistro , booth , caf , canteen , chuck wagon , coffee shop , concession , dump * , eatery , eating house , facility , fast-food outlet , greasy spoon * , grill , hash house , ice-cream parlor , lunch counter , lunchroom , lunch wagon , mess hall , quick-lunch , saloon , sandwich shop , snack bar , tearoom , cafe , eater , greasy spoon , guest , luncheonette , patron , restaurant