One who dines.
A typically small restaurant, usually modeled after a railroad dining car, that serves lower-class fare, normally having a counter with stools along one side and booths on the other, and often decorated in 50s and 60s pop culture themes and playing popular music from those decades.
A dining car in a railroad train.
A small restaurant serving light meals.
A bar-shaped snack, such as a chocolate bar.
A counter in some other establishment having the same function.