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.]

Smell \Smell\, v. i.
   1. To affect the olfactory nerves; to have an odor or scent;
      -- often followed by of; as, to smell of smoke, or of
      musk.

   2. To have a particular tincture or smack of any quality; to
      savor; as, a report smells of calumny.

            Praises in an enemy are superfluous, or smell of
            craft.                                --Milton.

   3. To exercise the sense of smell. --Ex. xxx. 38.

   4. To exercise sagacity. --Shak.

Smell \Smell\, n. [OE. smel, smil, smul, smeol. See {Smell}, v.
   t.] (Physiol.)
   1. The sense or faculty by which certain qualities of bodies
      are perceived through the instrumentally of the olfactory
      nerves. See {Sense}.

   2. The quality of any thing or substance, or emanation
      therefrom, which affects the olfactory organs; odor;
      scent; fragrance; perfume; as, the smell of mint.

            Breathing the smell of field and grove. --Milton.

            That which, above all others, yields the sweetest
            smell in the air, is the violent.     --Bacon.

   Syn: Scent; odor; perfume; fragrance.

Source : WordNet®

smell
     n 1: the sensation that results when olfactory receptors in the
          nose are stimulated by particular chemicals in gaseous
          form; "she loved the smell of roses" [syn: {odor}, {odour},
           {olfactory sensation}, {olfactory perception}]
     2: any property detected by the olfactory system [syn: {olfactory
        property}, {aroma}, {odor}, {odour}, {scent}]
     3: the general atmosphere of a place or situation and the
        effect that it has on people; "the feel of the city
        excited him"; "a clergyman improved the tone of the
        meeting"; "it had the smell of treason" [syn: {spirit}, {tone},
         {feel}, {feeling}, {flavor}, {flavour}, {look}]
     4: the faculty of smell [syn: {sense of smell}, {olfaction}, {olfactory
        modality}]
     5: the act of perceiving the odor of something [syn: {smelling}]
     [also: {smelt}]

smell
     v 1: inhale the odor of; perceive by the olfactory sense
     2: emit an odor; "The soup smells good"
     3: smell bad; "He rarely washes, and he smells"
     [also: {smelt}]