circumluvio

circumluviō ōnis, f

circum + luo, the formation of an island (by floods): circumluvionum iura, the law of title to alluvial lands .

circumluvio
circum-lŭvĭo, ōnis, f.; and cir-cumlŭvĭum, ii, n. [luo], the accumulation of land by alluvion around...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.