GNU Collaborative International Dictionary of English

Found 3 definitions

1.       
   Sniff , v. i. [imp. & p. p. Sniffed  or 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
   
         
       

2.       
   Sniff, v. t.
   To draw in with the breath through the nose; as, to sniff the air of the country.
   1913 Webster
   To perceive as by sniffing; to snuff, to scent; to smell; as, to sniff danger.
   1913 Webster
         
       

3.       
   Sniff, n. The act of sniffing; perception by sniffing; that which is taken by sniffing; as, a sniff of air.
   1913 Webster