The term "peninsular" refers to something that is in the form or shape of a peninsula, which is a piece of land that extends into a body of water and is surrounded by it on three sides. A peninsular region or territory is one that is separated from the mainland by another country or body of water. The term can also be used to describe something that is isolated or detached from others in some way, such as an idea or belief that stands apart from other ideas or beliefs.