keyhole

The noun refers to a physical aperture, often associated with secrecy or curiosity, as seen in the common trope of spying through a keyhole. It carries a connotation of restricted access or a narrow perspective.

When used as an adjective, the term is a specialized medical descriptor for minimally invasive surgery. In this context, it is a synonym for laparoscopic or endoscopic procedures, emphasizing the small size of the incision to reduce patient trauma and recovery time.