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Originally: = scotomy, n. In later use also: = scotoma, n. 2.
Originally: a condition characterized by the appearance of dark spots or a mist before the eyes (cf. scotoma, n. 2). In later use also: dizziness…
Medicine. Dizziness or vertigo, esp. when accompanied by impairment of vision; an instance of this. Cf. scotomia, n., scotomy, n. Obsolete.