What is small glass bottle that dressing served in?

You're likely thinking of a cruet.

A cruet is a small glass bottle, often with a stopper or lid, used to hold and serve condiments like oil, vinegar, soy sauce, or other dressings.

Here are some other possible names for the small glass bottle:

* Vinegar cruet

* Oil cruet

* Dressing bottle

* Condiment bottle

* Decanter (though this is usually used for larger bottles of alcohol)

Let me know if you have any other questions!