a form of gelatin prepared from the internal
membranes of fish bladders: it is used as a clarifying agent and adhesive
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'isinglass'prob. altered < MDu huizenblas, lit., sturgeon bladder < huizen, sturgeon + blas, bladder