In anatomy, a foramen is any opening.

A human skeleton - (endoskeleton) In biology, the skeleton or skeletal system provides a strong, internal framework that supports the body, makes up about 20 percent of its weight, and consists of 206 bones. These bones meet at joints, the majority of...

the apical foramen is the hole at the tip of the root of a tooth.

Foramina of skull

obturator foramen

greater sciatic foramen

vertebral foramen

lesser sciatic foramen

the foramen ovale (heart) is a hole between the venous and arterial sides of the fetal heart.

the foramen transversarium is one of a pair of openings in each cervical vertebra, in which the vertebral artery travels.