Definitions

1. noun

a transparent, colourless, and very pure form of gelatin, obtained by boiling animal hoofs and bones, used to clarify liquids and in various industrial processes

“The alchemist used isinglass to clarify the wine before serving it to the king.”

2. verb

to clear (a liquid) with isinglass or to make (something) clear and transparent

“The artist isinglassed the watercolour to achieve a clearer finish.”