Drill, dental

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Drill, dental

Drill, dental

A device that dentists use to drill into teeth.

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Drain
A device for removing fluid from a cavity or wound. A drain is typically a tube or wick.

DRE (digital rectal exam)
An exam done to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger into the rectum and feels for anything that is not normal. The digital rectal exam is an important screening test for the detection of tumors of the rectum and prostate abnormalities, including benign enlargement of the prostate (benign prostatic hyperplasia) and cancer of the prostate.

Dream, pre-sleep
Also called a hypnagogic hallucination, this type of dream is characteristically vivid and occurs as one is falling asleep or awakening.

Dreams
Thoughts, visions, and other sensations that occupy the mind in sleep. Dreams occur during that part of sleep when there are rapid eye movements (REMs). We have 3 to 5 periods of REM sleep per night. They usually come at intervals of 1-2 hours and are quite variable in length. An episode of REM sleep may be brief and last but 5 minutes. Or it may be much longer and go for over an hour. About 20% of sleep is REM sleep. If you sleep 7-8 hours a night, perhaps an hour and half of that time, 90 minutes, is REM sleep. REM sleep is characterized by a number of other features besides REM, including rapid, low-voltage brain waves on the electroencephalographic (EEG) recording, irregular breathing and irregular heart rate and -- what may be most evident to someone else -- involuntary muscle jerks. Non-REM (NREM) sleep is dreamless sleep. During NREM, the brain waves on the EEG are typically slow and of high voltage, the breathing and heart rate are both slow and regular, the blood pressure is low, and the sleeper is relatively still. NREM sleep is divided into 4 stages of increasing depth. About 80% of sleep is NREM sleep. If you sleep 7-8 hours a night, all but maybe an hour and a half is spent in dreamless NREM sleep. Dreams are penetrable; it has been found experimentally that one can communicate with a person who is dreaming.

Dressler syndrome
Pericarditis (inflammation of the pericardium, the sac-like covering of the heart) after a heart attack.

Drill, dental

Drinox
Trade name of the insecticide aldrin.

Drip
In medical usage, a drip is not a dull, unattractive person but a device for administering a fluid drop-by-drop into a vein. It is an intravenous (IV) fluid dripping into a vein, an intravenous fluid drip, a solution (usually a balanced electrolyte solution) administered directly into the venous circulation. It is, for short, an IV.

Drosophila
The fruit fly. One species, Drosophila melanogaster, is a favorite model organism in genetics and developmental biology.

Drosophila genome
All of the genetic information contained in Drosophila, the fruitfly. The genomes of particular nonhuman organisms such as Drosophila have been studied for a number of reasons including the need to improve sequencing and analysis techniques. These nonhuman genomes also provide powerful sets of data against which to compare the human genome.

Drug activity
A measure of the physiological response a drug produces. A less active drug produces less response (and visa versa).

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This dictionary contains 25007 terms.

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