Source : Webster's Revised Unabridged Dictionary (1913)

Yell \Yell\ (y[e^]l), v. i. [imp. & p. p. {Yelled}; p. pr. & vb.
   n. {Yelling}.] [OE. yellen, [yogh]ellen, AS. giellan, gillan,
   gyllan; akin to D. gillen, OHG. gellan, G. gellen, Icel.
   gjalla, Sw. g["a]lla to ring, resound, and to AS., OS., &
   OHG. galan to sing, Icel. gala. Cf. 1st {Gale}, and
   {Nightingale}.]
   To cry out, or shriek, with a hideous noise; to cry or scream
   as with agony or horror.

         They yelleden as feendes doon in helle.  --Chaucer.

         Nor the night raven, that still deadly yells.
                                                  --Spenser.

         Infernal ghosts and hellish furies round Environed
         thee; some howled, some yelled.          --Milton.

Source : WordNet®

yelling
     adj : noisy with or as if with loud cries and shouts; "a crying
           mass of rioters"; "a howling wind"; "shouting fans";
           "the yelling fiend" [syn: {crying}, {howling}, {shouting}]
     n : uttering a loud inarticulate cry as of pain or excitement
         [syn: {shouting}]