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- (idiomatic) An informal check of an idea or proposal, using one's common sense or sense of propriety.
- Synonym: reality check
- A fluoroscopic medical test during which the examinee is asked to "sniff" (quickly breathe in through the nose); diaphragm fluoroscopy.
- 1995, Charis Roussos, The Thorax: Disease, page 1771:
- The most reliable radiographic maneuver to detect paradoxical movement is the sniff test, consisting of rapidly repeated inspirations through the nostrils during fluoroscopy.