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Definition of Smell-O-Vision
1. Proper noun. A system that choreographed the release of odors during the projection of a film, invented by Hans Laube. ¹
2. Noun. (nonstandard) Any such system that adds olfaction to cinematography, often portrayed as futuristic or far-fetched. ¹
3. Noun. Cinematography with the addition of olfaction, often portrayed as futuristic or far-fetched. ¹
¹ Source: wiktionary.com