Webster's New World Medical Dictionary

anorexic 1
Pertaining to, or having the appear-
ance of, anorexia.
2
Lack of appetite.
3
A drug
or other agent that causes anorexia and so dimin-
ishes the appetite. See also 
anorexia.
anorexigenic
Causing anorexia (loss of
appetite) as, for example, an anorexigenic drug. See
also 
anorexia.
anorgasmia
Failure to achieve orgasm (climax)
during sexual intercourse. Anorgasmia has many
causes, including stress, anxiety, depression,
fatigue, worry, guilt, fear of painful intercourse, fear
of pregnancy, the undesirability of a partner, the
undesirability of a setting, and the use of alcohol or
prescription or illicit drugs.
anosmia
The failure of the development of or the
loss of the sense of smell.
anotia
The absence from birth of the external,
visible part of the ear (the auricle).
anoxia
The absence, or near absence, of oxygen.
Anoxia can injure tissues of the body.
ant, fire
See 
fire ant.
ant, velvet
See 
velvet ant.
ant sting
See 
fire ant.
antagonist
A substance that acts against and
blocks an action. Antagonist is the opposite of ago-
nist. Antagonists and agonists are key players in the
chemistry of the human body and in pharmacology.
antenatal diagnosis
See 
prenatal diagnosis.
anterior
The front. For example, the breastbone
is part of the anterior surface of the chest. Opposite
of posterior. See also Appendix B, “Anatomic
Orientation Terms.”
anterior cruciate ligament
A ligament in the
knee that crosses from the underside of the femur to
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anterior cruciate ligament
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the top of the tibia. Abbreviated ACL. Injuries to the
ACL can occur in a number of situations, including
sports, and can be quite serious, sometimes requir-
ing surgery. See also 
knee.