Webster's New World Medical Dictionary

roentgen
An international unit of X-ray or
gamma-ray radiation.
roentgenology
See 
radiology.
Rohypnol
The trade name for flunitrazepam,
which has been abused as a “date rape” drug.
Rohypnol produces sedative-hypnotic effects
including muscle relaxation and amnesia. It can
produce physical and psychological dependence
and can be lethal when mixed with alcohol and/or
other depressants.
rooting reflex
A reflex that is seen in normal
newborn babies, who automatically turn the face
toward the stimulus and make sucking (rooting)
motions with the mouth when the cheek or lip is
touched. The rooting reflex helps to ensure suc-
cessful breastfeeding.
Rorschach test
A common psychological test
that involves using inkblots that show enigmatic and
highly ambiguous shapes. Ten standardized blots
are shown, one at a time, to a person, and the per-
son’s responses are recorded, to determine what
the person perceives about the inkblots.
rosacea
A chronic skin disease that causes per-
sistent redness over the areas of the face and nose
that normally blush: mainly the forehead, the chin,
and the lower half of the nose. The tiny blood ves-
sels in these areas enlarge (dilate) and become
more visible through the skin, appearing like tiny
red lines (telangiectasias). Pimples that look like
teenage acne can occur. Rosacea occurs most often
between the ages of 30 and 60, especially in people
with fair skin. It affects both sexes. Although it tends
to occur more in women than in men, it is often
worse in men. In most people the symptoms come
and go, although it tends to worsen with time.
Rosacea can be treated but not cured. Topical
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rosacea
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antibiotics such as metronidazole, and oral antibi-
otics such as tetracycline, are often used. Short-term
topical cortisone (steroid) preparations of the right
strength may also be used to reduce local inflamma-
tion. Avoiding smoking, food and drink that cause
flushing (such as spicy food, hot beverages, and
alcoholic drinks), and other triggers such as tem-
perature extremes helps to minimize symptoms.