noun. any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity.
1. Noun, singular or mass After the invention of electricity, isinglass was used to make lamp shades because it is also resistant to electricity. 2. Verb, base form There are several alternatives to isinglass, added to the boiling wort or in the fermenter before bottling.
