a person or thing that
a device or mechanism for detecting something.
a device for detecting hidden substances such as drugs or explosives, esp by their odour
a computer program or device used to monitor, detect, and capture data on a network
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
The Free On-line Dictionary of Computing, © Denis Howe 2010
The device is a thousand times more sensitive than the current gold standard in explosives detection: the sniffer dog.
Specially trained sniffer dogs can smell something on the breath of lung cancer patients.
Sometimes a small, friendly sniffer dog comes around for a preliminary check.
The group doesn't stick a sniffer inside a closed car and consult a gauge.
Installing a packet sniffer does not necessarily require administrator-level access.
Consider purchase of an electronic sniffer to detect leaks.