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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

location go
a point or extent in space

space go
an empty area (usually bounded in some way between things)

opening, gap go
an open or empty space in or between things

foramen, hiatus
a natural opening or perforation through a bone or a membranous structure

noun.body

2 Subcategories

interventricular foramen, foramen of Monro, Monro's foramen go
the small opening (on both the right and left sides) that connects the third ventricle in the diencephalon with the lateral ventricle in the cerebral hemisphere
foramen magnum go
the large opening at the base of the cranium through which the spinal cord passes