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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 - «U»:

  1. Umbilical cord Umbilical cord
    Umbilical cord: The cord that connects the developing embryo or fetus with the placenta and through which run the umbilical arteries and vein. The matrix (the substance) of the umbilical cord is known as Wharton's jelly and is a rich source of stem cells. At birth the umbilical cord measures about ...
  2. Umbilicus Umbilicus
    Umbilicus: The vestige left behind on a newborn's belly when the umbilical cord is cut. Also called the navel or belly button....
  3. UMP UMP
    UMP: Uridine monophosphate....
  4. Unassisted childbirth Unassisted childbirth
    Unassisted childbirth: Birth of a baby without the assistance of an obstetrician, midwife, or other health professional. This may be by accident or by design. Unassisted childbirth is fraught with risks since about a fifth of apparently normal pregnancies develop unexpected complications during labo...
  5. Uncertainty Uncertainty
    Uncertainty: You may be uncertain why "uncertainty" deserves a place in a medical dictionary but some would say that uncertainty is a key element in medicine. "The core predicament of medicine -- the thing that makes being a patient so wrenching, being a doctor so difficult and being a part of a so...
  6. Unconscious Unconscious
    Unconscious: 1. Interruption of awareness of oneself and one's surroundings, lack of the ability to notice or respond to stimuli in the environment. A person may become unconscious due to oxygen deprivation, shock, central nervous system depressants such as alcohol and drugs, or injury. 2. In p...
  7. Unconsciousness, temporary Unconsciousness, temporary
    Unconsciousness, temporary: A partial or complete loss of consciousness with interruption of awareness of oneself and ones surroundings. When the loss of consciousness is temporary and there is spontaneous recovery, it is referred to as syncope or, in nonmedical quarters, fainting. Syncope acco...
  8. Under the weather Under the weather
    Under the weather: Colloquial expression for sick or ill as, for example, to be under the weather with the flu. The phrase "under the weather" came from British sailing ships. When a sailor became ill he was confined below deck out of the weather, so it was said that he was under the weather....
  9. Underload syndrome Underload syndrome
    Underload syndrome: Literally being "bored sick." Lack of stimulation in life (such as with an extremely dull job) can result in depression and health problems including headaches, fatigue and recurrent infection....
  10. Underventilation Underventilation
    Underventilation: See: Hypoventilation....
  11. Underwater weighing Underwater weighing
    Underwater weighing: A method for determining the lean body mass. This method weighs a person underwater and then calculates the lean body mass (muscle) and body fat. This method is one of the more accurate ones. However, it is generally done in special research facilities, and the equipment is cost...
  12. Undifferentiated cancer Undifferentiated cancer
    Undifferentiated cancer: A cancer in which the cells are very immature and "primitive" and do not look like cells in the tissue from it arose. As a rule, an undifferentiated cancer is more malignant than a cancer of that type which is well differentiated. Undifferentiated cells are said to be anapla...
  13. Undulant fever Undulant fever
    Undulant fever: An infectious disease due to the bacteria Brucella that characteristically causes rising and falling fevers, sweats, malaise, weakness, anorexia, headache, myalgia (muscle pain) and back pain. The disease is called undulant fever because the fever is typically undulant, rising and...
  14. Undulatant Undulatant
    Undulatant: Having a wavy border or form. Also, rising and falling like a wave. For example, the border of a wound may be undulant, as may the edge of a rash. And sound waves may also be undulant. The word "undulant" comes from the Latin "undula" which is the diminutive of "unda" meaning wave. So "...
  15. Undulate Undulate
    Undulate: To have a wavy border or form. Also, to rise and fall like a wave. For example, the border of a wound may undulate, as may the edge of a rash. And sound waves may undulate. The word "undulate" comes from the Latin "undula" which is the diminutive of "unda" meaning wave. So "undula" is a l...