The Collaborative International Dictionary of English v.0.48:

Bark \Bark\, Barque \Barque\, n. [F. barque, fr. Sp. or It.
   barca, fr. LL. barca for barica. See Barge.]
   [1913 Webster]
   1. Formerly, any small sailing vessel, as a pinnace, fishing
      smack, etc.; also, a rowing boat; a barge. Now applied
      poetically to a sailing vessel or boat of any kind.
      --Byron.
      [1913 Webster]

   2. (Naut.) A three-masted vessel, having her foremast and
      mainmast square-rigged, and her mizzenmast
      schooner-rigged.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Barque \Barque\, n.
   Same as 3d Bark, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barque
    n 1: a sailing ship with 3 (or more) masts [syn: bark,
         barque]