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lacustrine age

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WordReference Random House Unabridged Dictionary of American English © 2020
la•cus•trine  (lə kustrin),USA pronunciation adj. 
  1. of or pertaining to a lake.
  2. living or growing in lakes, as various organisms.
  3. Geologyformed at the bottom or along the shore of lakes, as geological strata.
  • Italian lacustr(e) of lakes + -ine1
  • 1820–30

Collins Concise English Dictionary © HarperCollins Publishers::
lacustrine /ləˈkʌstraɪn/ adj
  1. of or relating to lakes
  2. living or growing in or on the shores of a lake
Etymology: 19th Century: from Italian lacustre, from Latin lacus lake

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