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Drugs and diseases reference index

Drugs and diseases reference index
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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Parthenogenesis Parthenogenesis
    Parthenogenesis: Development of a germ cell without fertilization. This is what happens in the formation of ovarian teratomas (dermoid cysts). All of the chromosomes in these benign tumors of the ovary come from the mother. The counterpart of the ovarian teratoma is the hydatidiform mole, a tumor th...
  2. Partial hysterectomy Partial hysterectomy
    Partial hysterectomy: In a partial hysterectomy, the uterus is surgically removed but the cervix is left in place. Also called a subtotal hysterectomy....
  3. Partial laryngectomy Partial laryngectomy
    Partial laryngectomy: A surgical procedure on the voice box designed to preserve the voice. The surgeon removes part of the voice box -- one vocal cord, part of a cord, or the epiglottis -- and leaves the rest, The stoma opening into the trachea is temporary. After a brief recovery period, the trac...
  4. Partial seizure Partial seizure
    Partial seizure: A seizure that affects only one part of the brain. Symptoms depend on which part is affected. One part of the body, or multiple body parts confined to one side of the body, may start to twitch uncontrollably. Partial seizures may involve head turning, eye movements, lip smackin...
  5. Partial syndactyly Partial syndactyly
    Partial syndactyly: A condition in which fingers or toes are partially joined together. Syndactyly can involve the bones or just the skin. With partial syndactyly, the connection extends from the base only part way up the involved digits. Partial syndactyly is the opposite of complete syndactyl...
  6. Participant Participant
    Participant: 1. In a clinical trial, someone who takes part in it. A participant may or may not have a disease. The term participant in this regard is synonymous with the term subject. 2. In health care benefits, a person who is eligible to receive health benefits under a health benefits plan. The ...
  7. Particle, alpha Particle, alpha
    Particle, alpha: A tiny mass of material composed of two protons and two neutrons. Alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes or even the layer of dead cells which normally protects the skin. Because alpha particles cann...
  8. Parturition Parturition
    Parturition: Childbirth, the process of delivering the baby and placenta from the uterus to the vagina to the outside world. Also called labor and delivery. Parturition comes from the Latin parturire, "to be ready to bear young" and is related to partus, the past participle of parere, "to produce...
  9. Parumbilical Parumbilical
    Parumbilical: Near the umbilicus (the "belly button"). The parumbilical veins are small veins in the front wall of the abdomen near the umbilicus....
  10. Parvovirus B19 Parvovirus B19
    Parvovirus B19: See: Fifth disease...
  11. Parvovirus infection Parvovirus infection
    Parvovirus infection: Infection with one of a family of small single-stranded DNA viruses. (Parvovirus means small virus, from the Latin parvus, small.) One type, parvovirus B19, infects only humans. There are also animal parvoviruses, but they do not infect humans. A person cannot catch parvoviru...
  12. PAS PAS
    PAS: 1. Physician-assisted suicide. 2. Personal alert system (an alarm system for an elderly or infirm person). 3. Periodic acid-Schiff (a stain used to detect carbohydrates in tissue). ...
  13. Passage, nasal Passage, nasal
    Passage, nasal: The walls of the nasal passages are coated with respiratory mucous membranes which contain innumerable tiny hair-like cells that act to move waves of mucus toward the throat. Dust, bacteria, and other particles inhaled from the air are trapped by the mucus in the nose, carried back, ...
  14. Passive exercise Passive exercise
    Passive exercise: Movement of the body, usually of the limbs, without effort by the patient. The patient is passive....
  15. Passive immunity Passive immunity
    Passive immunity: Immunity produced by the transfer to one person of antibodies that were produced by another person. Protection from passive immunity diminishes in a relatively short time, usually a few weeks or months. For example, antibodies passed from the mother to the baby before birth confer ...