The Collaborative International Dictionary of English v.0.48:

Sniff \Sniff\, v. t.
   1. To draw in with the breath through the nose; as, to sniff
      the air of the country.
      [1913 Webster]

   2. To perceive as by sniffing; to snuff, to scent; to smell;
      as, to sniff danger.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sniff \Sniff\, n.
   The act of sniffing; perception by sniffing; that which is
   taken by sniffing; as, a sniff of air.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sniff \Sniff\, v. i. [imp. & p. p. Sniffedor Snift; p. pr. &
   vb. n. Sniffing.] [OE. sneven; akin to snivel, snuff; cf.
   Dan. snive to sniff. See Snuff, v. t.]
   To draw air audibly up the nose; to snuff; -- sometimes done
   as a gesture of suspicion, offense, or contempt.
   [1913 Webster]

         So ye grow squeamish, gods, and sniff at heaven. --M.
                                                  Arnold.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sniff
    n 1: sensing an odor by inhaling through the nose [syn: sniff,
         snuff]
    v 1: perceive by inhaling through the nose; "sniff the perfume"
         [syn: sniff, whiff]
    2: inhale audibly through the nose; "the sick student was
       sniffling in the back row" [syn: sniff, sniffle]

The Free On-line Dictionary of Computing (19 January 2023):

poll
polling
sniff

   To check the status of an input line, sensor, or memory
   location to see if a particular external event has been
   registered.

   Contrast interrupt.

   [Jargon File]

   (1995-01-31)


The Free On-line Dictionary of Computing (19 January 2023):

Sniff

   A C++/C programming environment providing browsing,
   cross-referencing, design visualisation, documentation and
   editing support.  Developed by UBS Switzerland and marketed by
   takeFive Salzburg.

   [Jargon File]


The Jargon File (version 4.4.7, 29 Dec 2003):

sniff
 v.,n.

    1. To watch packets traversing a network. Most often in the phrase packet
    sniffer, a program for doing same. 2. Synonym for poll.