Webster's New World Medical Dictionary

autopsy
A postmortem examination. Also known
as necropsy.
autosomal
Pertaining to a chromosome that is
not a sex chromosome. People normally have 22
pairs of autosomes (44 autosomes) in each cell,
together with 2 sex chromosomes, X and Y in a male
and X and X in a female.
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autosomal dominant trait
A genetic trait that
appears in patients who have received one copy of a
specific autosomal (nonsex) gene for that particular
trait. For example, achondroplasia, Marfan syn-
drome, and Huntington disease are autosomal dom-
inant traits.
autosomal recessive trait
A genetic trait that
appears only in patients who have received two
copies of a specific autosomal (nonsex) gene for
that particular trait, one from each parent. For
example, sickle cell anemia and cystic fibrosis are
autosomal recessive traits.
autosome
Any chromosome other than the X and
Y sex chromosomes. People normally have 22
pairs of autosomes (44 autosomes) in each cell.
aux
Prefix indicating growth or increase.
AV 1
Atrioventricular. Relating to the atrium(atria)
and ventricle(s) of the heart.
2
Arteriovenous.
Relating to an artery(ies) and a vein(s).
AV node
Atrioventricular node.
avascular necrosis
A condition in which poor
blood supply to an area of bone leads to bone death.
Abbreviated AVN. Also known as aseptic necrosis
and osteonecrosis.
avian influenza
A highly contagious viral disease
with up to 100 percent mortality in domestic fowl.
Caused by influenza A virus subtypes H5 and H7. All
types of birds are susceptible to the virus, but out-
breaks occur most often in chickens and turkeys.
The infection may be brought by migratory wild
birds which can carry the virus, but show no signs of
disease. Humans are only rarely affected. Also
known as fowl plague, avian flu, and bird flu.