ectocommensal
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ec·to·com·men·sal
(ĕk′tə-kə-mĕn′səl)n.
A commensal organism that lives on the outer body surface of another organism.
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.