peri- +

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.

The envelope of modified leaves surrounding the antheridia in mosses.

A careless or inaccurate delineation (representing, portraying, or describing, as by lines, diagrams, sketches, etc.) of anything.

1. Situated around the pistil or ovary: said of the stamens when growing upon some part surrounding the ovary (either the calyx, or the corolla, or the edge of the hollowed receptacle); also said of a flower in which the stamens are so placed.
2. Having sepals, petals, and stamens around the edge of a cuplike receptacle containing the ovary, as in flowers of the rose or cherry.
3. Of or being perigynous flower parts; such as, stamens, petals, etc., so arranged.
4. Anything surrounding a female reproductive organ.
5. Opposites of epigynous and hypogynous.

1. The point in the orbit of a planet or comet at which it is nearest to the sun.
2. The point nearest the sun in the orbit of a planet or other celestial body.