The Collaborative International Dictionary of English v.0.48:

Wail \Wail\, v. i.
   To express sorrow audibly; to make mournful outcry; to weep.
   [1913 Webster]

         Therefore I will wail and howl. --Micah i. 8.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wail \Wail\, n.
   Loud weeping; violent lamentation; wailing. "The wail of the
   forest." --Longfellow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wail \Wail\, v. t. [Cf. Icel. val choice, velja to choose, akin
   to Goth. waljan, G. w[aum]hlen.]
   To choose; to select. [Obs.] "Wailed wine and meats."
   --Henryson.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wail \Wail\, v. t. [imp. & p. p. Wailed; p. pr. & vb. n.
   Wailing.] [OE. wailen, weilen, probably fr. Icel. v[ae]la;
   cf. Icel. v[ae], vei, woe, and E. wayment, also OE. wai, wei,
   woe. Cf. Woe.]
   To lament; to bewail; to grieve over; as, to wail one's
   death. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

wail
    n 1: a cry of sorrow and grief; "their pitiful laments could be
         heard throughout the ward" [syn: lament, lamentation,
         plaint, wail]
    v 1: emit long loud cries; "wail in self-pity"; "howl with
         sorrow" [syn: howl, ululate, wail, roar, yawl,
         yaup]
    2: cry weakly or softly; "she wailed with pain" [syn: wail,
       whimper, mewl, pule]