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

A colorless, gray, green, or yellow magnesium oxide mineral.
1. A variety of albite occurring in large, white opaque crystals.
2. A dome-shaped fold in sedimentary rock.
Relating to the pericranium; surrounding the skull.
pericranium (s), pericrania (pl)
The membrane of connective tissue that surrounds the skull.
pericycle (s) (noun), pericycles (pl)
The outermost cell layer of the stele in a plant, frequently becoming a multilayered zone.
A slender, relatively undifferentiated, connective tissue cell that occurs around capillaries or other small blood vessels.
Excision of a ring of conjunctiva behind the limbus, followed by cauterization of the trench thus made.
Very clear, conspicuous.
In medicine, surrounding the dendrites.
1. The outer cork layer of a plant that replaces the epidermis of primary tissues. Cells have their walls impregnated with cutin and suberin.
2. The hard outer covering of hydroids and other marine animals; the perisarc.
3. The outermost layer of the epidermis of an embryo or a fetus up to the sixth month of gestation.
peridermal, peridermic
Relating to the periderm.
The almost inappreciable time which elapses between the systole and the diastole of the heart.
The envelope or coat of certain fungi, such as the puffballs and earthstars.
peridontal, peridontic
Inflammatory reaction of the tissues surrounding a tooth (periodontium), usually resulting from the extension of gingival inflammation (gingivitis) into the periodontium.
The space between the columns and the wall of the cella, in a Greek or a Roman temple.

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