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Of or relating to a drainage basin whose surface water runs into the ocean or into another body of water having a connection to the ocean.

[exo- + Greek rhein, rhe-, to flow; see sreu- in Indo-European roots + -ic.]

ex′o·rhe′i·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Site 1--Lake Tonga: naturally endorheic and artificially exorheic system.
Kor, Maharloo) and exorheic basins (Mond, Persian Gulf) of the Fars area, as detailed by Ramsey et al.
This region corresponds to what is known as the dry puna and is characterised by the existence of permanent lakes and exorheic basins with low precipitation (200 to 350 mm/year).