Definition of isinglass in English:



mass noun
  • 1A kind of gelatin obtained from fish, especially sturgeon, and used in making jellies, glue, etc. and for fining real ale.

    • ‘The animal kingdom was represented by gelatin in the form of meat stock; isinglass; and hartshorn.’
    • ‘Antonin poured the thickening isinglass alternately into the fruit juice and the almond milk.’
    • ‘Sometimes the wood surface was prepared with a coating of gesso or isinglass diluted in water with a little white pigment added.’
    • ‘Guinness uses isinglass, a form of gelatine made from fish bladders, in the production process to make the stout clearer.’
    • ‘There is no evidence that isinglass is detrimental to health.’
  • 2US Mica or a similar material in thin transparent sheets.


Mid 16th century alteration (by association with glass) of obsolete Dutch huysenblas ‘sturgeon's bladder’, from huysen ‘sturgeon’ + blas ‘bladder’.