alethoscope (English, noun)
expansion: alethoscope (plural alethoscopes)
Senses:
glosses: An instrument, invented in the 1860s, for viewing magnified pictures by means of a single lens inside a box. By varying the intensity of the light, the same picture can be shown as "daytime" or "nighttime".
tags: historical
Forms:
form: alethoscopes
tags: plural