fin

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fin

(fĭn)
n.
A membranous appendage extending from the body of a fish or other aquatic animal, used for propelling, steering, or balancing the body in the water.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

fin

a flattened limb found in aquatic animals, and used for locomotion.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Deteriorating water quality leads to a build-up of bacteria which can cause fin rot.
The diseases caused by pathogenic bacteria include epizootic ulcerative syndrome (EUS) tail rot, fin rot, gill rot, hemorrhagic septicemia, scale oedema, furunculosis, bacterial kidney diseases and columnaris disease (Robert, 1989; Thune et al., 1993; Chowdhury and Baqui, 1997).
After the loss of poor Edmund, who died from fin rot following serious overfeeding and water stagnation, we have been parsimonious with the fish flakes and vigilant over water quality.