Webster’s Revised Unabridged Dictionary · 1913
Lacustral
La·cus′tral, 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.