One of the mysteries of the English language finally explained.
1An auto-ophthalmoscope or autolaryngoscope; (also) a laryngoscope through which the larynx can be seen directly (as opposed to by a mirror) (now historical).
2An object or device used as an indicator of psychic or parapsychological processes or phenomena. Now historical and rare.
Late 19th century. From auto- + -scope, in sense 1 perhaps partly as shortening of autolaryngoscope, and partly as shortening of auto-ophthalmoscope. Compare French autoscope, German Autoskop.
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