The Collaborative International Dictionary of English v.0.48:

Bemoan \Be*moan"\, v. t. [imp. & p. p. Bemoaned; p. pr. & vb.
   n. Bemoaning.] [OE. bimenen, AS. bem?nan; pref. be- + m?nan
   to moan. See Moan.]
   To express deep grief for by moaning; to express sorrow for;
   to lament; to bewail; to pity or sympathize with.
   [1913 Webster]

         Implores their pity, and his pain bemoans. --Dryden.
   [1913 Webster]

   Syn: See Deplore.
        [1913 Webster]

WordNet (r) 3.0 (2006):

bemoan
    v 1: regret strongly; "I deplore this hostile action"; "we
         lamented the loss of benefits" [syn: deplore, lament,
         bewail, bemoan]