Webster's New World Medical Dictionary

259
Marfan syndrome
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good medical management, the life expectancy in
Marfan syndrome now approximates that for the
general population.
marijuana
A common street and recreational
drug that comes from the marijuana plant: the hemp
plant cannabis sativa. The pharmacologically active
ingredient in marijuana is tetra-hydro-cannabinol
(THC). Marijuana is used to heighten perception,
affect mood, and relax. Many people think mari-
juana is harmless, but it is not. Signs of marijuana
use include red eyes, lethargy, and uncoordinated
body movements. The long-term effects may include
decrease in motivation and harmful effects on the
brain, heart, lungs, and reproductive system. People
who smoke marijuana are also at increased risk of
developing cancer of the head and neck. A pharma-
ceutical product, Marinol, that contains synthetic
THC, is available as a prescription medication. It
comes in the form of a pill (eliminating the harmful
and cancer-causing chemicals present when mari-
juana is smoked) and is used to relieve the nausea
and vomiting associated with chemotherapy for can-
cer patients and to treat loss of appetite in AIDS
patients.
mark, strawberry
See 
hemangioma, capillary.
marker 1
See 
gene marker.
2
A blood marker
or a tumor marker. See also 
blood marker; tumor
marker.
marker, blood
See 
blood marker.
marker, gene
See 
gene marker.
marker, tumor
See 
tumor marker.
marker chromosome
See 
chromosome,
marker.