Webster's New World Medical Dictionary

partner strand would be TAC.
DNR
Do not resuscitate.
D.O.
Doctor of Osteopathy, an osteopathic physi-
cian. See also 
osteopath; osteopathy.
dizziness, anxiety as a cause of
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do not resuscitate
A directive to not attempt
mechanical or manual resuscitation if the patient
stops breathing. Abbreviated DNR. See also 
advance
directive.
DOB
Date of birth, an abbreviation that is fre-
quently used in medical charting.
doctor
In a medical context, any medical profes-
sional with an MD, a PhD, or any other doctoral
degree. The term doctor is quite unspecific. A doc-
tor may, for example, be a physician, psychologist,
biomedical scientist, dentist, or veterinarian. In a
nonmedical context, a professor of history might be
addressed as doctor, an eminent theologian might
be named a doctor of a church, and a person
awarded an honorary doctorate by a college or uni-
versity might also be called a doctor.
doctors’ symbol
See 
Aesculapius.
DOE
Department of Energy, a US agency.
dolor
Pain, one of the four classic signs of
inflammation together with calor, rubor, and tumor
(heat, redness, and swelling, respectively).
domain
In biomedicine, a discrete portion of a
protein that has its own function. The combination
of domains in a single protein determines the over-
all function of the protein.
dominant
A genetic trait that is evident when only
one copy of that gene for that trait is present. (As
opposed to a recessive trait, which is usually
expressed only when two copies of the gene for that
trait are present.) Most dominant traits are due to
genes located on the autosomes (the nonsex chro-
mosomes). Diseases inherited in an autosomal dom-
inant manner typically affect both males and females
and each of their children run a 50 percent chance
to receive their disease gene. Autosomal dominant
diseases include achondroplasia (dwarfism with
short arms and legs), Huntington disease (a form of
progressive dementia), and neurofigromatosis (a
neurologic disorder with an increased risk of malig-
nant tumors). X-linked dominance is due to genes
on the X chromosome. A single copy of the mutant
gene on the X chromosome causes the disease in a
female. An example is a type of hereditary rickets
called hypophosphatemic rickets. See also 
autoso-
mal dominant trait; X-linked dominant.