Is this dish (or vessel) called "casserole"?

Question

A Ukrainian book says that what I know as cooking pot is casserole. Now I checked Cambridge and Oxford dictionaries and there's not such definition for casserole. So before I'm going to tell my friend that it is a mistake I just want to be sure about that.

The only definition in Cambridge dictionary for casserole:

a dish made by cooking meat, vegetables, or other foods in liquid inside a heavy container at low heat, or the heavy, deep container with a lid used in cooking such dishes:

The definitions of Oxford dictionary for casserole:

1. A kind of stew that is cooked slowly in an oven.

1.1 A large covered dish used for cooking casseroles.

How do these definitions have to do something with the cooking pot that we see in the picture as casserole?

Answer 1

I think that your book is right and that point is reflected in the meaning that you have already found in Oxford Dictionary

1.1 A large covered dish used for cooking casseroles.

The cookware used for making casseroles is also known as casserole, casserole pot or casserole dish. This last one seems to be used to name the object used to serve the casserole instead of the object used to cook it.

Maybe the image that appears in your book is not exactly how modern casseroles (pot) look like but the cooking pot used for making casseroles is the casserole.