Lacustral La*cus"tral, Lacustrine La*cus"trine, a. [L. lacus lake: cf. F. lacustral, lacustre.] Found in, or pertaining to, lakes or ponds, or growing in them; as, lacustrine flowers. Lacustrine deposits (Geol.), the deposits which have been accumulated in fresh-water areas. Lacustrine dwellings. See Lake dwellings, under Lake.