The Collaborative International Dictionary of English v.0.48:

Barreled \Bar"reled\, Barrelled \Bar"relled\, a.
   1. Having a barrel; -- used in composition; as, a
      double-barreled gun.
      [1913 Webster]

   2. put in or stored in a barrel;; as, barreled beer; --
      opposite of unbarreled.
      [WordNet 1.5]

   3. tapered toward both ends; -- of an arrow.
      [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Barrel \Bar"rel\ (b[a^]r"r[e^]l), v. t. [imp. & p. p. Barreled
   (-r[e^]ld), or Barrelled; p. pr. & vb. n. Barreling, or
   Barrelling.]
   To put or to pack in a barrel or barrels.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Double-barreled \Dou"ble-bar`reled\, or -barrelled \-bar`relled\
,  a.
   Having two barrels; -- applied to a gun.
   [1913 Webster]

WordNet (r) 3.0 (2006):

barrelled
    adj 1: put in or stored in a barrel; "barreled beer" [syn:
           barreled, barrelled] [ant: unbarreled,
           unbarrelled]
    2: (of an arrow) tapered toward both ends [syn: barreled,
       barrelled]