Source : Webster's Revised Unabridged Dictionary (1913)

Smell \Smell\, v. t. [imp. & p. p. {Smelled}, {Smelt}; p. pr. &
   vb. n. {Smelling}.] [OE. smellen, smillen, smullen; cf. LG.
   smellen, smelen, sm["o]len, schmelen, to smoke, to reek, D.
   smeulen to smolder, and E. smolder. Cf. {Smell}, n.]
   1. To perceive by the olfactory nerves, or organs of smell;
      to have a sensation of, excited through the nasal organs
      when affected by the appropriate materials or qualities;
      to obtain the scent of; as, to smell a rose; to smell
      perfumes.

   2. To detect or perceive, as if by the sense of smell; to
      scent out; -- often with out. ``I smell a device.''
      --Shak.

            Can you smell him out by that?        --Shak.

   3. To give heed to. [Obs.]

            From that time forward I began to smellthe Word of
            God, and forsook the school doctors.  --Latimer.

   {To smell a rat}, to have a sense of something wrong, not
      clearly evident; to have reason for suspicion. [Colloq.]
      

   {To smell out}, to find out by sagacity. [Colloq.]

Smelling \Smell"ing\, n.
   1. The act of one who smells.

   2. The sense by which odors are perceived; the sense of
      smell. --Locke.

   {Smelling bottle}, a small bottle filled with something
      suited to stimulate the sense of smell, or to remove
      faintness, as spirits of ammonia.

Source : WordNet®

smelling
     n : the act of perceiving the odor of something [syn: {smell}]

smelling
     adj : (used with `of' or `with') noticeably odorous; "the hall was
           redolent of floor wax"; "air redolent with the fumes of
           beer and whiskey" [syn: {redolent(p)}, {smelling(p)}]