sniff

Short definition from Wiktionary

Verb

1. 1
   To make a short, audible inhalation, through the nose, as when smelling something.
2. 2
   To say (something) while sniffing, such as in case of illness or unhappiness, or in contempt.
3. 3
   To perceive vaguely.
4. 4
   To pry; to investigate in an interfering manner.
5. 5
   To be dismissive or contemptuous of something; used with at.
6. 6
   To intercept and analyse packets of data being transmitted over a network.
7. 7
   To inhale drugs (usually cocaine) through the nose, usually in powder form.

Noun

1. 1
   An instance of sniffing.
2. 2
   A quantity of something that is inhaled through the nose.
3. 3
   A brief perception, or tiny amount.
4. 4
   Cocaine.
5. 5
   A toddler or young child.

Interjection

1. 1
   A short inhalation sound, sometimes associated with crying.