britannic

from WordNet (r) 3.0 (2006)

Britannic
    adj 1: of Britain; "Her Britannic Majesty"

from The Collaborative International Dictionary of English v.0.48

Britannic \Bri*tan"nic\, a. [L. Britannicus, fr. Britannia Great
   Britain.]
   Of or pertaining to Great Britain; British; as, her Britannic
   Majesty.
   [1913 Webster] Brite