What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Definition of tropostereoscope in English:
tropostereoscope
noun
Psychologyrare, historical
A stereoscope with an arrangement for rotating the pictures, used in experiments on vision.
Origin
Early 20th century; earliest use found in American Journal of Psychology. After German Tropostereoskop.
