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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Pericardium, parietal Pericardium, parietal
    Pericardium, parietal: The outer layer of the pericardium which is a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels. The pericardium has outer and inner coats. The outer coat is tough and thickened, loosely cloaks the heart, and is attached to the ce...
  2. Pericardium, visceral Pericardium, visceral
    Pericardium, visceral: The inner layer of the pericardium, a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels. The pericardium has outer and inner coats. The outer coat is tough and thickened, loosely cloaks the heart, and is attached to the centra...
  3. Pericentric chromosome inversion Pericentric chromosome inversion
    Pericentric chromosome inversion: A basic type of chromosome rearrangement in which a segment that includes the centromere (and so is pericentric) has been snipped out of a chromosome, turned through 180 degrees (inverted), and inserted back into its original location in chromosome. The feature ...
  4. Perichondrial Perichondrial
    Perichondrial: To do with the perichondrium, a dense membrane composed of fibrous connective tissue that closely wraps all cartilage, except the cartilage in joints which is covered by a synovial membrane. Peri- is a prefix borrowed from the Greek meaning "around or about" and "-chondrial" also...
  5. Perichondritis Perichondritis
    Perichondritis: Inflammation of the perichondrium, a dense membrane composed of fibrous connective tissue that closely wraps all cartilage, except the cartilage in joints which is covered by a synovial membrane. The word "perichondritis" comes from Greek roots: "peri-" is a prefix meaning "arou...
  6. Perichondrium Perichondrium
    Perichondrium: A dense membrane composed of fibrous connective tissue that closely wraps (invests) all cartilage, except the cartilage in joints which is covered by a synovial membrane. Peri- is a prefix borrowed from the Greek meaning "around or about" and "-chondrium" also comes from a Greek w...
  7. Perichondroma Perichondroma
    Perichondroma: A tumor arising from the perichondrium, the dense membrane composed of fibrous connective tissue that closely wraps (invests) all cartilage (except the articular surfaces of the cartilage in joints which are covered by synovial membranes). Perichondromas are benign. ...
  8. Perilingual Perilingual
    Perilingual: During the development of speech and language. "The age of onset continues to have important implications for cochlear implantation, depending on whether the hearing impairment occurred before (prelingual), during (perilingual), or after (postlingual) learning speech and language." (Fro...
  9. Perimenopause Perimenopause
    Perimenopause: The time in a woman's life when physiological changes occur that begin the transition to menopause. Menopause is the time when there have been no menstrual periods for 12 consecutive months. A woman can usually tell if she is experiencing symptoms characteristic of the perimenopa...
  10. Perinatal Perinatal
    Perinatal: Pertaining to the period immediately before and after birth. The perinatal period is defined in diverse ways. Depending on the definition, it starts at the 20th to 28th week of gestation and ends 1 to 4 weeks after birth. The word "perinatal" is a hybrid of the Greek "peri-" meaning "...
  11. Perinatal transmission Perinatal transmission
    Perinatal transmission: Transmission of a disease-causing agent (a pathogen) from mother to baby during the perinatal period, the period immediately before and after birth. The perinatal period is defined in diverse ways. Depending on the definition, it starts at the 20th to 28th week of gestation...
  12. Perinatologist Perinatologist
    Perinatologist: An obstetrical subspecialist concerned with the care of the mother and fetus at higher-than-normal risk for complications. Since the perinatal period, depending on the definition, starts at the 20th to 28th week of gestation and ends 1 to 4 weeks after birth, a perinatologist lo...
  13. Perinatology Perinatology
    Perinatology: A subspecialty of obstetrics concerned with the care of the mother and fetus at higher-than-normal risk for complications. Since the perinatal period, depending on the definition, starts at the 20th to 28th week of gestation and ends 1 to 4 weeks after birth, perinatology logicall...
  14. Perineal Perineal
    Perineal: Of or relating to the perineum....
  15. Perineal prostatectomy Perineal prostatectomy
    Perineal prostatectomy: An operation to remove the prostate gland through an incision made between the scrotum and the anus....