sniffer: meaning, definition, pronunciation and examples
B2Informal, Technical
Quick answer
What does “sniffer” mean?
A person or device that detects or investigates something by smelling or searching, especially for illegal substances or data.
Audio
Pronunciation
Definition
Meaning and Definition
A person or device that detects or investigates something by smelling or searching, especially for illegal substances or data.
A program or tool that intercepts and logs network traffic; a dog trained to detect drugs or explosives; a person who inhales solvents or glue for intoxication.
Dialectal Variation
British vs American Usage
Differences
No significant differences in core meaning. 'Packet sniffer' is the standard technical term in both varieties.
Connotations
In both, the 'drug detection' sense is neutral/technical; the 'data interception' sense carries a potential negative connotation of surveillance or hacking.
Frequency
Equally common in IT/security contexts. Slightly more frequent in UK media regarding drug-sniffing dogs.
Grammar
How to Use “sniffer” in a Sentence
[sniffer] + [of + NP] (a sniffer of packets)[NP] + [sniffer] (packet sniffer)[use/deploy/run] + [a sniffer]Vocabulary
Collocations
Examples
Examples of “sniffer” in a Sentence
verb
British English
- The dog was trained to sniff for explosives.
- The software sniffs packets on the local network.
American English
- The dog will sniff out any contraband.
- The tool sniffs network traffic for anomalies.
adjective
British English
- The sniffer dog alerted its handler.
- They conducted a sniffer test on the network.
American English
- The airport uses sniffer technology.
- A sniffer program was installed.
Usage
Meaning in Context
Business
Rare, except in IT security consulting ('We need to run a sniffer to diagnose the network issue').
Academic
Used in computer science/network security papers ('The experiment employed a packet sniffer').
Everyday
Most commonly associated with police and airport security ('The sniffer dog found the luggage').
Technical
Standard term in networking and cybersecurity for a traffic analysis tool.
Watch out
Common Mistakes When Using “sniffer”
- Using 'sniffer' as a verb (the verb is 'to sniff'). Incorrect: 'He sniffered the network.' Correct: 'He used a sniffer on the network.'
- Confusing 'sniffer dog' with 'search dog' – all sniffer dogs search, but not all search dogs use scent.
FAQ
Frequently Asked Questions
No, it can be a device (packet sniffer), an animal (sniffer dog), or a person (one who sniffs glue, though this is dated).
It depends on context and jurisdiction. Using one on a network you own or have permission to test is legal. Using it to intercept others' private data without consent is generally illegal.
A sniffer dog specifically uses its sense of smell to detect target substances (drugs, explosives). A search dog may use smell, sight, or sound to find people or objects.
No, the noun 'sniffer' is derived from the verb 'to sniff'. You cannot say 'to sniffer'. Correct usage: 'The dog will sniff (verb) for drugs' or 'It is a sniffer (noun) dog'.
A person or device that detects or investigates something by smelling or searching, especially for illegal substances or data.
Sniffer is usually informal, technical in register.
Sniffer: in British English it is pronounced /ˈsnɪf.ər/, and in American English it is pronounced /ˈsnɪf.ɚ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “sniffer dog (fixed phrase)”
- “packet sniffer (fixed tech phrase)”
Learning
Memory Aids
Mnemonic
Think of a dog SNIFFing around – a SNIFFer detects things. A network sniffer 'sniffs out' data packets.
Conceptual Metaphor
DETECTION IS SMELLING / INVESTIGATION IS TRACKING BY SCENT.
Practice
Quiz
In which context is the word 'sniffer' LEAST likely to be used?