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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 - «O»:

  1. Over-the-counter (OTC) drug Over-the-counter (OTC) drug
    Over-the-counter (OTC) drug: A drug for which a prescription is not needed....
  2. Overactive bladder Overactive bladder
    Overactive bladder: A sudden involuntary contraction of the muscular wall of the bladder causing urinary urgency, an immediate unstoppable need to urinate. It is a form of urinary incontinence (the unintentional loss of urine) and affects about 1 in 11 adults, particularly older adults. Treatment ma...
  3. Overbreathing Overbreathing
    Overbreathing: See: Hyperventilation....
  4. Overgrowth Overgrowth
    Overgrowth: Just what it sounds like: excessive growth....
  5. Overgrowth syndrome Overgrowth syndrome
    Overgrowth syndrome: One in a group of disorders resulting in overgrowth, as evidenced by unusually large size at birth, excessive postnatal growth, and increased weight, increased length, and/or increased head circumference. There is an increased risk of cancer in a number of the overgrowth syndrom...
  6. Overload, iron Overload, iron
    Overload, iron: Iron overload can damage the heart, liver, gonads and other organs. Iron overload is a particular risk for: People with certain genetic conditions such as hemochromatosis; and People receiving repeated blood transfusions. According to the National Academy of Sciences, the Recommend...
  7. Overweight Overweight
    Overweight: The term "overweight" is used in two different ways. In one sense it is a way of saying imprecisely that someone is heavy. The other sense of "overweight" is more precise and designates a state between normal weight and obesity. The National Institutes of Health (NIH) now defines overwe...
  8. Ovulation Ovulation
    Ovulation: The release of the ripe egg from the ovary. The egg is released when the cavity surrounding it (the follicle) breaks open in response to a hormonal signal. Ovulation occurs around fourteen or fifteen days from the first day of the woman's last menstrual cycle. When ovulation occurs, t...
  9. Ovulatory Ovulatory
    Ovulatory: Relating to ovulation, the release of the ovum (the egg) from the ovary....
  10. Ovum Ovum
    Ovum: An egg in the ovary of the female. This egg is called the female "gamete" or sex cell. It combines with the male gamete, called a sperm, to form a zygote. This formation process is called "fertilization." (see sperm, zygote)....
  11. Oxter Oxter
    Oxter: The armpit. From the Old English oxta or ohsta. The word oxter is used in certain areas of the world (Scotland, Ireland, Northern England), reminding us that there are many local and colloquial names for parts of the human anatomy. Synonymous with axilla....
  12. Oxy Oxy
    Oxy: Street name for OxyContin, prescription painkiller that has become a popular and dangerous recreational drug. OxyContin is a time-release morphine-like narcotic intended to relieve chronic pain of moderate to severe proportions. One pill of OxyContin is designed to last 12 hours. The active...
  13. Oxycodone Oxycodone
    Oxycodone: Oxycodone is the active ingredient in OxyContin. Oxycodone is an opioid, a close relative of morphine, heroin, codeine, fentanyl, and methadone....
  14. OxyContin OxyContin
    OxyContin: A prescription painkiller that has become a popular and dangerous recreational drug. Also called "Oxy" in the street. OxyContin is a time-release morphine-like narcotic intended to relieve chronic pain of moderate to severe proportions. One pill of OxyContin is designed to last 12 hours....
  15. Oxygen Oxygen
    Oxygen: A colorless, odorless and tasteless gas that makes up about 20% of the air we breathe (and at least half the weight of the entire solid crust of the earth) and which combines with most of the other elements to form oxides. Oxygen is essential to human, animal and plant life. The chemical sym...