| fortification figures | The zigzag banding of light, resembling the walls of fortified medieval towns, that marks the margin of the scintillating scotoma of migraine. Synonym: fortification figures, telehopsias. (05 Mar 2000) |
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| fortification spectrum | The zigzag banding of light, resembling the walls of fortified medieval towns, that marks the margin of the scintillating scotoma of migraine. Synonym: fortification figures, telehopsias. (05 Mar 2000) |
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| widmanstatten figures | <chemical> Certain figures appearing on etched meteoric iron; so called after A. B. Widmanstatten, of Vienna, who first described them in 1808. See the Note and Illust. Under Meteorite. Source: Websters Dictionary (01 Mar 1998) |
| Purkinje's figures | <ophthalmology> Shadows of the retinal vessels, seen as dark lines on a reddish field when a light enters the eye through the sclera and not the pupil. (05 Mar 2000) |