(noun)
a piece of some material that forms part of the outer body or shell of something, such as a thin sheet of molded metal that is part of the body of a car, or a section of fabric that is part of an article of clothing;
e.g. This panel of the car was damaged by the collision with the bicycle. The skirt has a panel of lace at its front.
(noun)
each of the sections of a piece of art, for example one of drawings in a comic strip or cartoon, or a part of of a larger design that contains a pattern or decoration of another subject;
e.g. The leftmost panel of the painting depicts a wolf howling at the moon.
(noun)
a small group of people that is formed in order to decide on or investigate some particular matter, for example the group of available jurors;
e.g. The selection panel for the competition was struggling to agree on a winner.
(verb)
to fit flat, rectangulat sections into a wall, floor, or ceiling;
e.g. They plan to panel the walls of the room with hardwood.