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Definition of Sniff test
1. Noun. (idiomatic) An informal reality check of an idea or proposal, using one's common sense or sense of propriety. ¹
¹ Source: wiktionary.com
Medical Definition of Sniff test
1. at fluoroscopy, a test for diaphragmatic function; paradoxical motion of a hemidiaphragm when a patient sniffs vigorously shows phrenic nerve paralysis or paresis of the hemidiaphragm. If rapid upward movement of the diaphragm occurs on brisk sniffing in the supine position, it is highly suggestive of paralysis of the diaphragm. (05 Mar 2000)