From The Collaborative International Dictionary of English v.0.48 :
Riparian \Ri*pa"ri*an\, a. [L. riparius, fr. ripa a bank. See River, and cf. Arrive.] Of or pertaining to the bank of a river; as, riparian rights. [1913 Webster]From WordNet (r) 3.0 (2006) :
riparian adj 1: of or relating to or located on the banks of a river or stream; "riparian land"