| nystagmoid | Resembling nystagmus. Synonym: nystagmiform. Origin: nystagmus + G. Eidos, resemblance (05 Mar 2000) |
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| nystagmus | <neurology> An involuntary, rapid, rhythmic movement of the eyeball, which may be horizontal, vertical, rotatory or mixed, i.e., of two varieties. Origin: Gr. Nystagmos = drowsiness, from nystazein = to nod (18 Nov 1997) |
| nystagmus test | A test for vestibular function, made by irrigating the external auditory meatus with either hot or cold water; this normally causes stimulation of the vestibular apparatus, resulting in nystagmus and past-pointing; in vestibular disease, the response may be reduced or absent. Synonym: caloric test, nystagmus test. (05 Mar 2000) |
| nystagmus, optokinetic | The normal or physiological nystagmus induced by the attempt to fixate objects moving rapidly across the field of vision. It occurs, for example, when viewing objects from a moving railroad car or automobile. It is also called railroad nystagmus. (12 Dec 1998) |
| nystagmus, physiologic | Involuntary rhythmical movements of the eyes in the normal person. These can be naturally occurring as in end-position (end-point, end-stage, or deviational) nystagmus or induced by the optokinetic drum (nystagmus, optokinetic), caloric test, or a rotating chair. (12 Dec 1998) |
| nystatin | <drug> A polyene antibiotic active against fungi. The name is derived from new York State Health Department where it was discovered as a product of Streptomyces noursei. (18 Nov 1997) |
| Nysten's law | Rigor mortis affects first the muscles of the head and spreads toward the feet. (05 Mar 2000) |
| Nysten, Pierre | <person> French physician, 1771-1818. See: Nysten's law. (05 Mar 2000) |
| nyula | <zoology> A species of ichneumon (Herpestes nyula). Its fur is beautifully variegated by closely set zigzag markings. Source: Websters Dictionary (01 Mar 1998) |
| nyxis | A pricking; paracentesis. Origin: G. (05 Mar 2000) |