Irregular.
The type of matter that has a definite shape but no definite volume is a solid. Solids have a fixed shape because their particles are closely packed together, but they can change volume slightly in response to temperature and pressure changes.
A gas is a type of matter that does not have a definite shape or size. Gases will expand to fill the space available to them, taking on the shape of their container.
WATER has no definite shape but has definite volume.
liquid
gas
Our galaxy is a spiral galaxy because it is spiral in shape.
No, an EO galaxy is not a type of elliptical galaxy. They are a lenticular galaxy.
The Ovular galaxy does not exist.However, an object that is ovular in shape is egg shaped.An elliptical galaxy has an ellipsoidal or egg shape.
A gas.
A plastic or fluid.
Milk and gasoline are examples of liquid matter. They are substances that take the shape of their container and have a definite volume, but not a definite shape.
That sounds like the description of an "elliptical galaxy".