Source : Webster's Revised Unabridged Dictionary (1913)

Smolder \Smol"der\, Smoulder \Smoul"der\, n.
   Smoke; smother. [Obs.]

         The smolder stops our nose with stench.  --Gascoigne.

Smolder \Smol"der\, Smoulder \Smoul"der\, v. i. [imp. & p. p.
   {Smoldered}or {Smouldered}; p. pr. & vb. n. {Smoldering} or
   {Smouldering}.] [OE. smolderen; cf. Prov. G. sm["o]len,
   smelen, D. smeulen. Cf. {Smell}.]
   1. To burn and smoke without flame; to waste away by a slow
      and supressed combustion.

            The smoldering dust did round about him smoke.
                                                  --Spenser.

   2. To exist in a state of suppressed or smothered activity;
      to burn inwardly; as, a smoldering feud.

Smolder \Smol"der\, Smoulder \Smoul"der\, v. t.
   To smother; to suffocate; to choke. [Obs.] --Holinshed.
   Palsgrave.

Smoulder \Smoul"der\, v. i.
   See {Smolder}.

Source : WordNet®

smoulder
     n : a smouldering fire; "the smoulder became a blaze"
     v 1: have strong suppressed feelings [syn: {smolder}]
     2: burn slowly and without a flame; "a smoldering fire" [syn: {smolder}]