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Full of, attended with, or involving, peril; dangerous; hazardous; as, a perilous undertaking. Infamous hills, and sandy, perilous wilds. Milton.

The fluid which surrounds the membranous labyrinth of the internal ear, and separates it from the walls of the chambers in which the labyrinth lies.

Around, or at the side of, a lymphatic vessel.

Pertaining to, or containing, perilymph.

The outer boundary of a body or figure, or the sum of all the sides.

Of or pertaining to the perimeter, or to perimetry; as, a perimetric chart of the eye.

The art of using the perimeter; measurement of the field of vision.

A crystal of one species inclosing one of another species. See Endomorph.

Of or pertaining to the perimysium.

The connective tissue sheath which surrounds a muscle, and sends partitions inwards between the bundles of muscular fibers.

See Perineum.

Of or pertaining to the perineum.

The act or process of restoring an injured perineum.

The operation of sewing up a ruptured perineum.

Inflammation of the cellular tissue around the kidney. -- Per`i*ne*phrit"ic, a.

The region which is included within the outlet of the pelvis, and is traversed by the urinogenital canal and the rectum.

Surrounding nerves or nerve fibers; of or pertaining to the perineurium.

The connective tissue sheath which surrounds a bundle of nerve fibers. See Epineurium, and Neurilemma.

Of or pertaining to a nucleus; situated around a nucleus; as, the perinuclear protoplasm.

hich something is completed, and ready to recommence and go on in the same order; as, the period of the sun, or the earth, or a comet.