[1] : The Collaborative International Dictionary of English v.0.48

lacustral \lacus"tral\, lacustrine \lacus"trine\, a. l. lacus
   lake: cf. f. lacustral, lacustre.
   found in, or pertaining to, lakes or ponds, or growing in
   them; as, lacustrine flowers.
   1913 webster

   lacustrine deposits geol., the deposits which have been
      accumulated in fresh-water areas.

   lacustrine dwellings. see lake dwellings, under lake.
      1913 webster
see also:
lacustrine deposits lacustrine dwellings lake dwellings lake 

[2] : WordNet (r) 2.0

lacustrine
     adj : of or relating to or living near lakes

Lacustrine >> L Words
Lacustrine, definition of term: Lacustrine
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