(Greek: around, enclosing, surrounding, about, near, close; often used as a prefix)

A collector of transport tickets.
The primitive perivisceral (around the viscera or interior organs) cavity.
Surrounding the esophagus.
Around a leaf margin.
Surrounding or around a follicle.
1. Surrounding a ganglion, especially a nerve ganglion.
2. Near or around a ganglion.

The celebrated 2nd century Greek physician, Galen (about 130-201 A.D.), who lived and worked in Rome first used the word ganglion to refer to a nerve complex.

Ganglion still is used to refer to an aggregation of nerve cell bodies. Another use of the word ganglion is for a tendon cyst that most commonly pops up near the wrist.

A ganglion is a sac-like swelling or cyst formed from the tissue that lines a joint or tendon. The tissue, called synovium, normally functions to produce lubricating fluid for these areas.

A ganglion is a cyst formed by the synovium that is filled with a thick jelly-like fluid. While ganglia can follow local trauma to the tendon or joint, they usually form for unknown reasons. Occasionally, ganglia are early signs of arthritis that will become more obvious in the future.

The point in the orbit of a heavenly body; especially, the moon, or of an artificial satellite at which it is nearest to the earth.
Periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth.
1. The point nearest the earth's center in the orbit of the moon or a satellite.
2. The point in any orbit nearest to the body being orbited.
A theory which explains inheritance by the transmission of the type of growth force possessed by one generation to another.
Inflammation of the tissues around the tongue.
Near or around the tongue.
The mucous membrane of the tongue.
Situated around the jaw or jaws.
perigonium (s), perigonia (pl), perigone
The envelope of modified leaves surrounding the antheridia in mosses.

Related "around, round, surrounding" units: ambi-; ampho-; circ-; circum-; cyclo-, -cycle; gyro-.