Pentaerythritol tetranitrate

What is Pentaerythritol tetranitrate?

Pentaerythritol tetranitrate definition and meaning on Dictionary terms:
noun Chemistry, Pharmacology.

a white, crystalline, water-insoluble, explosive solid, C5H8N4O12, used chiefly as a high explosive and as a vasodilator in treating angina pectoris.