The periorbita is the area around the
orbit
In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as ...
. Sometimes it refers specifically to the layer of tissue surrounding the orbit that consists of
periosteum
The periosteum is a membrane that covers the outer surface of all bones, except at the articular surfaces (i.e. the parts within a joint space) of long bones. Endosteum lines the inner surface of the medullary cavity of all long bones.
Structu ...
.
However, it may refer to anything that is around the orbit, such as in
periorbital cellulitis.
References
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Tissues (biology)
Human eye anatomy