Noun
The glassy residue left on the desert floor after the Trinity nuclear bomb test of 1945 at Alamogordo, New Mexico, USA.
by extension, any melt glasses left by atomic bombs
Source: en.wiktionary.orgThe white overshoes were to prevent the trinitite fallout from sticking to the soles of their shoes. Source: Internet
The crater was far more radioactive than expected due to the formation of trinitite, and the crews of the two lead-lined Sherman tanks were subjected to considerable exposure. Source: Internet