| snell | A short line of horsehair, gut, etc, by which a fishhook is attached to a longer line. Source: Websters Dictionary (01 Mar 1998) |
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| Snell's law | For two given media, the sine of the angle of incidence bears a constant relation to the sine of the angle of refraction. Synonym: Descartes' law, Snell's law. (05 Mar 2000) |
| Snellen | Hermann, Dutch ophthalmologist, 1834-1908. See: Snellen's test types, Snellen's sign. (05 Mar 2000) |
| Snellen's sign | <clinical sign> Bruit heard on auscultation over the eye in a patient with Graves' disease, due to the hyperdynamic circulation. (05 Mar 2000) |
| Snellen's test types | Square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5' at a particular distance. (05 Mar 2000) |