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pleustonic

British  
/ pluːˈstɒnɪk /

adjective

  1. of or relating to pleuston

  2. denoting a marine organism held at the surface of the water by a float, such as the Portuguese man-of-war

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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