Source : Webster's Revised Unabridged Dictionary (1913)

Peninsular \Pen*in"su*lar\, a. [Cf. F. p['e]ninsulaire.]
   Of or pertaining to a peninsula; as, a peninsular form;
   peninsular people; the peninsular war.

Source : WordNet®

peninsular
     adj : of or forming or resembling a peninsula; "peninsular
           isolation"