a. and sb. rare. [f. as next + -IAN.] A. adj. = LACUSTRINE 1 b. B. sb. An inhabitant of a lacustrine dwelling.
1865. Reader, 8 July, 30. The waters of the Lake of Constance have been so low this winter as to allow important researches to be made concerning the lacustrian habitations.
1884. W. Westall, in Contemp. Rev., XLVI. 70. There is ample evidence that the Lacustrians of the Bronze Period had reached a high degree of civilization.
