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Definition of Smell test
1. Noun. (idiomatic) An informal method for determining whether something is authentic, credible, or ethical, by using one's common sense or sense of propriety. ¹
2. Noun. An inspection of an object using the sense of smell, as for freshness of food. ¹
3. Noun. (physiology) An assessment of a subject's ability to detect and distinguish odors. ¹
¹ Source: wiktionary.com