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  • A:G ratio
    abbreviation for albumin:globulin ratio.
  • AA
    Abbreviation for arteries [TA], arteriae [TA].
  • AA (amino acid)

    AA (amino acid): Stands not only for Alcoholics Anonymous but also for amino acids, the building blocks of proteins. There are 20 amino acids from which proteins are assembled. Of these 20 amino acids, 9 are deemed "essential" in that the human body cannot make them so they are needed in the diet.

  • AAA
    Older abbreviation for abdominal aortic aneurysm; commonly, procedure for surgical correction of an AAA.
  • AAA (abdominal aortic aneurysm)

    AAA (abdominal aortic aneurysm): Many Americans know that the AAA ("triple A") is short for the American Automobile Association. Fewer may be aware that it is also the acronym for the American Association of Anatomists, one of a multitude of professional societies in the health arena. The AMA (the American Medical Association) is a far better known example. Only a small selection of these health-related organizations is given as a sampler in this DICTIONARY. The abbreviation AAA also stands for abdominal aortic aneurysm, a ballooning of the largest artery (the aorta) as it courses down through the abdomen. At the point of an abdominal aneurysm, the aneurysm usually measures 3 cm or more in diameter. The aneurysm weakens the wall of the aorta and can end in the aorta rupturing with catastrophic consequences. As the diameter of the aorta increases, the chances of an an abdominal aortic aneurysm rupturing rise commensurately. A measurement of 5 cm is often used to recommend surgery. Persons with abdominal aortic aneurysm tend to be 60 or over and are 5 times more likely to be male than female.

  • aaa disease
    endemic anemia of ancient Egypt, ascribed in the Papyrus Ebers to intestinal infestation with ancylostoma; now called ancylostomiasis.
  • AAAS (Amer. Assn. for the Advancement of Science)

    AAAS (American Association for the Advancement of Science): . Spoken of as the "triple-AS", the American Association for the Advancement of Science is an organization concerned not only with the biomedical sciences but with all of the sciences. The AAAS publishes the weekly journal "Science", one of the great scientific periodicals. "Science" carries a remarkable range of new scientific information including, for example, findings from the Apollo mission to Mars as well as reports from the project to map the human genome.

  • Aad
    Abbreviation for α-aminoadipic acid.
  • AAD (American Association of Dermatology)

    AAD (American Association of Dermatology): One of a multitude of professional societies in the health arena. The AMA (the American Medical Association) is a better known example in the U.S. Only a small selection of the many health-related organizations is given as a sampler in this DICTIONARY.

  • AAFP (American Association of Family Physicians)

    AAFP (American Association of Family Physicians): Originally, most physicians in the U.S. (and elsewhere) were family doctors. Then there was a strong move away from family medicine toward the medical specialties in the U.S. The pendulum now has swung back to a more equitable balance between family practice and the medical (and surgical) specialties. The AAFP is a professional society for American family doctors.

  • Aagenaes syndrome
    an idiopathic form of familial intrahepatic cholestasis associated with lymphedema of the lower extremities.
  • AAMC
    Abbreviation for Association of American Medical Colleges.
  • AAO (ambiguity)

    AAO (ambiguity): The abbreviation AAO provides an instance of ambiguity or, at least some confusion, since it stands for multiple health-related organizations including the American Association of Ophthalmology, American Association of Orthodontists, and American Academy of Otolaryngology.

  • AAOS (American Academy of Orthopaedic Surgeons)

    AAOS (American Academy of Orthopaedic Surgeons): The professional organization of American orthopaedists. Literally, the practice of child straightening, orthopaedics is the branch of surgery that is broadly concerned with the skeletal system (bones).

  • AAP (American Academy of Pediatrics)

    AAP: Although the abbreviation AAP stands for multiple health-related organizations (including the American Academy of Pedodontics, the American Academy of Periodontology, and the American Association of Pathologists), it also stands (very importantly) for the American Academy of Pediatrics (to which this writer just happens to belong). The American Academy of Pediatrics does provide a suitable example of a health professional organization. The American Academy of Pediatrics (AAP) and its member pediatricians "dedicate their efforts and resources to the health, safety and well-being of infants, children, adolescents and young adults." According to the Academy, it had as of 1998 some 53,000 members in the United States, Canada and Latin America. Over 34,000 of them were board-certified and called Fellows of the American Academy of Pediatrics (FAAP). The American Academy of Pediatrics was founded in June, 1930 by 35 pediatricians who met in Detroit in response to the need for an independent pediatric forum to address children's needs. When the Academy was established, the idea that children have special developmental and health needs was a new one. Preventive health practices now associated with child care � such as immunizations and regular health exams � were only just beginning to change the custom of treating children as "miniature adults." The activities of the Academy include advocacy for children and youth; public education; research; professional education; membership service and advocacy for pediatricians. One of the Academy's major activities also is to further the professional education of its members; continuing education courses, biannual scientific meetings, seminars, publications and statements from committees and sections form the basis of a continuing postgraduate educational program. More than 30 committees develop many of the Academy's positions and programs. Committees have interests as varied as injury and poison prevention, disabled children, sports medicine, nutrition and child health financing. The Academy publishes the scientific journal called Pediatrics monthly; Pediatrics in Review, its continuing education journal; and the monthly membership newspaper AAP News. It also periodically publishes manuals on such topics as infectious diseases and school health. In its public education efforts, the AAP produces patient education brochures, Healthy Kids magazine, and a series of child care books written by AAP members. Each year the Academy designates October as Child Health Month to emphasize the importance of preventive health care and other child health issues. The Academy executes original research in social, economic and behavioral areas and promotes funding of research. It maintains a Washington Office to ensure that children's health needs are taken into consideration as legislation and public policy are developed. The AAP's state advocacy staff provides assistance to chapters, promoting issues such as child safety legislation and Medicaid policies that increase access to care for low-income children.

  • AAR
    Abbreviation for antigen-antibody reaction.
  • Aaron sign
    in acute appendicitis, a referred pain or feeling of distress in the epigastrium or precordial region on continuous firm pressure over the McBurney point.
  • AASH
    Abbreviation for adrenal androgen-stimulating hormone.
  • AAV
    Abbreviation for adeno-associated virus.
  • AB
    From, away from, off. Prefix applied to electrical units in the CGS-electromagnetic system to distinguish them from units in the CGS-electrostatic system (prefix stat-) and those in the metric system or SI (no prefix).
  • ab initio
    From the beginning.
  • ab-
    From, away from, off. Prefix applied to electrical units in the CGS-electromagnetic system to distinguish them from units in the CGS-electrostatic system (prefix stat-) and those in the metric system or SI (no prefix).
  • Ab- (prefix)

    Ab- (prefix): Prefix from the Latin meaning �from, away from, off� as in abduction (movement of a limb away from the midline of the body), ablate (carry or cut away), abnormal (away from normal), absorb (to suck away). "Abs" in the plural is slang for the abdominal muscles.

  • Abadie sign of tabes dorsalis
    insensibility to pressure over the tendo achillis.
  • abampere
    Electromagnetic unit of current equal to 10 absolute amperes; a current that exerts a force of 2π dynes on a unit magnetic pole at the center of a circle of wire 1 cm in radius.
  • abapical
    Opposite the apex.
  • abapical pole
    in an oocyte, the pole opposite the animal pole (vegetal pole).
  • abarognosis
    Loss of ability to appreciate the weight of objects held in the hand, or to differentiate among objects of different weights. When the primary senses are intact, caused by a lesion of the contralateral parietal lobe.
  • abasic
    Affected by, or associated with, abasia. Refers to loss of pyrimidine sites in DNA.

    Alternate names: abatic

  • abatement
    A diminution or easing. Reduction, ultimately elimination, of public-health nuisances such as smoke or loud noise.
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