adipose fin

from The Collaborative International Dictionary of English v.0.48

Adipose \Ad"i*pose`\ (?; 277), a. [L. adeps, adipis, fat,
   grease.]
   Of or pertaining to animal fat; fatty.
   [1913 Webster]

   {Adipose fin} (Zool.), a soft boneless fin.

   {Adipose tissue} (Anat.), that form of animal tissue which
      forms or contains fat.
      [1913 Webster] Adiposeness