-rə̇n adjective
Etymology: probably from French or Italian lacustre lacustrine (from Latin lacus lake; probably influenced by Latin paluster, palustris marshy) + English -ine — more at lake
1. : of, relating to, or formed in lakes
lacustrine waters
lacustrine deposits
2. : growing or living in lakes
a lacustrine flora
lacustrine fishes
3. : of or relating to dwellings built on piles in lakes especially in prehistoric central Europe, Scotland, and Ireland