Webster's New World Medical Dictionary



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Webster s New World Medical Dictionary (1)

narcotic 1
A drug that causes insensibility or stu-
por. A narcotic induces narcosis, from the Greek
“narke” for “numbness or torpor.”
2
A drug such
as marijuana which is subject to regulatory restric-
tions comparable to those for addictive narcotics.
nares
The nostrils.
nasal
Having to do with the nose.
nasal decongestant
A drug that shrinks the
swollen membranes in the nose, making it easier to
breathe. Decongestants can be taken orally or as
nasal drops or spray. Nasal decongestants should
not be used for more than 5 days in a row without a
physician’s consent. When nasal decongestants are
used for a long time and then discontinued, symp-
toms often worsen (a rebound effect) because the
tissues become dependent on the medication.
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nasal passage
A channel for airflow through the
nose. The walls of the nasal passages are coated
with respiratory mucous membranes, which contain
innumerable tiny hair-like cells that move waves of
mucus toward the throat. Dust, bacteria, and other
particles inhaled from the air are trapped by the
mucus in the nose, carried back, swallowed, and
dropped into the gastric juices so that any potential
harm they might do is nullified. The organs of smell
are made up of patches of tissue called olfactory
membranes. The olfactory membranes are about
the size of a postage stamp and are located in a pair
of clefts just under the bridge of the nose. Most air
breathed in normally flows through the nose, but
only a small part reaches the olfactory clefts to get a
response to an odor. When a person sniffs to detect
a smell, air moves faster through the nose, increas-
ing the flow to the olfactory clefts and carrying more
odor to these sensory organs.
nasal polyp
A growth or protrusion of tissue in
the nose or sinuses. Nasal polyps may produce no
symptoms or may lead to obstruction of the nasal
passages, sinus infection, and a decreased sense of
smell. Nasal polyps are almost always benign.
Treatment can involve medications or surgery.
nasal septum
The dividing wall that runs down
the middle of the nose, separating the two nasal
cavities, each of which ends in a nostril. The nasal
septum is composed of bone, cartilage, and
membranes.

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