pleustonic
British
/ pluːˈstɒnɪk /
adjective
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of or relating to pleuston
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denoting a marine organism held at the surface of the water by a float, such as the Portuguese man-of-war
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.