Mirror

(mirf-or). I. A term applied to any polished surface that reflects a large proportion of the licjht falling upon it, especially a gla silvered on the anterior, or coated with a tin-amalgam on the posterior surface. Mirrors, plane or focusing, are used in the ophthalmoscope, laryngoscope, otoscope, etc., tc reflect light into the cavity studied, and thus illuminate it for observation. 2. The movable silvered gla with a plane and a concave face for illuminating the object in microscopic observation. M. -bar, the bar supporting the mirror of a microscope. M., Dentists', a small speculum designed for the examination of the teeth; a mouth-gla . M., Frontal, M., Head, a circular mirror with a central perforation, strapped to the head by a band, and used to throw light on parts to be examined. M.- writing, a peculiarity of penmanship observed in left-handed persons, and characterized bya reversal of the form and arrangement of the letters, which appear as if seen in a mirror. M