The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]WordNet (r) 3.0 (2006):
peninsular adj 1: of or forming or resembling a peninsula; "peninsular isolation"