| darkfield c. |
one with a central stop, permitting production of a hollow cone of light having its apex in the plane of the specimen.
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| darkfield i. |
the throwing of peripheral rays of light upon a microscopical object from the side, the center rays being blocked out: the object appears bright upon a dark background. See under microscope, and see ultramicroscope.
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| darkfield m. |
one with a central stop in the condenser, permitting diversion of the light rays and illumination of the object from the side, so that the details appear light against a dark background. See also ultramicroscope.
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| darkness t. |
involuntary movements of the eyes, resembling nystagmus, which occur in young animals kept in the dark.
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| darkroom t. |
a test to determine the tendency to develop acute angle-closure glaucoma: ocular pressure is measured by the applanation tonometer, the subject is placed in a darkroom for one hour, and applanation tonometry is then repeated.
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| DAR | move with sudden speed |
|---|---|
| DAR | move along rapidly and lightly |
| DAR | run or move very quickly or hastily |
| DAR | a circular board of wood or cork used as the target in the game of darts |
| DAR | someone who plays the game of darts |
| DAR | a sling-like device used in various primitive societies to propel a dart or spear |
| DAR | a circular board of wood or cork used as the target in the game of darts |
| DAR | a person or other animal that moves abruptly and rapidly |
| DAR | fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill |
| DAR | moving forward suddenly and swiftly |
| DAR | a game in which darts are thrown at a dartboard |
| DAR | a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive |