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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «M»:

  1. Meningomyelocele Meningomyelocele
    Meningomyelocele: Protrusion of the membranes that cover the spine but some of the spinal cord itself through a defect in the bony encasement of the vertebral column. The bony defect is spina bifida. ...
  2. Meniscus Meniscus
    Meniscus: The word "meniscus" comes from the Greek and refers to a crescent-shaped structure. Today a meniscus is something that is shaped like a crescent moon or a croissant pastry. A meniscus can be an anatomic feature. For example, the medial meniscus of the knee is a crescent-shaped cartilage pa...
  3. Meniscus injury Meniscus injury
    Meniscus injury: Injuries to the crescent-shaped cartilage pads between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface for the joint to move on. The two menisci are easily injured by the force of rotating the knee while bear...
  4. Meniscus, lateral knee Meniscus, lateral knee
    Meniscus, lateral knee: The word "meniscus" refers to a crescent-shaped structure. The lateral meniscus of the knee is a thickened crescent-shaped cartilage pad between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface for th...
  5. Meniscus, medial knee Meniscus, medial knee
    Meniscus, medial knee: The word "meniscus" refers to a crescent-shaped structure. The medial meniscus of the knee is a thickened crescent-shaped cartilage pad between the two joints formed by the femur (the thigh bone) and the tibia (the shin bone). The meniscus acts as a smooth surface for the join...
  6. Menkes syndrome Menkes syndrome
    Menkes syndrome: A genetic disorder, also known as kinky hair syndrome, in which the hair is fragile and twisted ("kinky") and there is progressive deterioration of the brain and arterial changes leading to death in infancy. The condition is an inborn error of metabolism that markedly decreases the ...
  7. Menometrorrhagia Menometrorrhagia
    Menometrorrhagia: Excessive uterine bleeding, both at the usual time of menstrual periods and at other irregular intervals. Menometrorrhagia can be a sign of a number of different disorders including hormone imbalance, endometriosis, benign fibroid tumors in the uterus, and, rarely, cancer. Women...
  8. Menopause Menopause
    Menopause: The time in a woman's life when menstrual periods permanently stop; it is also called the "change of life." Menopause is the opposite of the menarche. Menopause is defined as the time when there has been no menstrual periods for 12 consecutive months and no other biological or physiol...
  9. Menopause transition Menopause transition
    Menopause transition: A woman can usually tell if she is approaching menopause because her menstrual periods starts changing. The medical terms used to describe this time are the "menopause transition" and "perimenopause". The changes of the menopause transition (perimenopause) typically begin ...
  10. Menopause, chemical Menopause, chemical
    Menopause, chemical: Menopause induced by chemotherapy or other chemicals or medications. Chemical menopause is a type of "induced menopause." Induced menopause is distinct from natural menopause which occurs when the ovaries naturally decrease their production of the sex hormones estro...
  11. Menopause, induced Menopause, induced
    Menopause, induced (and "induced" menopause): Menopause induced by an unusual event, such as occurs when the ovaries are damaged by radiation, chemotherapy or other medications; or as occurs when the ovaries are surgically removed (by bilateral oophorectomy). Induced menopause is distinct from...
  12. Menopause, natural Menopause, natural
    Menopause, natural: Natural menopause occurs when the ovaries naturally decrease their production of the sex hormones estrogen and progesterone; there are no menstrual periods for 12 consecutive months; and no other biological or physiological cause can account for this. Menopause is the end of...
  13. Menopause, radiation Menopause, radiation
    Menopause, radiation: Menopause induced by radiation. Radiation menopause is a type of "induced menopause." Induced menopause is distinct from natural menopause which occurs when the ovaries naturally decrease their production of the sex hormones estrogen and progesterone. Induced meno...
  14. Menopause, surgical Menopause, surgical
    Menopause, surgical: Surgical menopause is, not unexpectedly, menopause induced by surgery. Surgical menopause is a type of induced menopause: menopause due to an unusual event. It is induced when the ovaries are surgically removed (by bilateral oophorectomy). Menopause can also be induced whe...
  15. Menorrhagia Menorrhagia
    Menorrhagia: Excessive uterine bleeding occurring at the expected intervals of the menstrual periods. The bleeding from the uterus starts on schedule but is heavier than usual and may last longer than usual. Menorrhagia may be a sign of an underlying disorder, such as hormone imbalance, endometriosi...