adj. Of, pertaining to, or produced by rivers; fluvial
the GNU version of the Collaborative International Dictionary of English
adj. Belonging to rivers or streams; existing in or about rivers; produced by river action; fluvial.
The Century Dictionary and Cyclopedia
Of riverine nature; growing in or near fresh water; produced by river action; fluvial: as, fluviatile species or deposits.
Word Usage
"All the rocks are of Pliocene or Pleistocene, fluviatile origin, and consist mainly of sandstones, conglomerates, quartzites, shales and micaceous sandstone."