bomb-grade

the compound "bomb-grade" is a modern technical term originating in the mid-20th century nuclear age. the first element, "bomb," directly references its intended destructive purpose. the second element, "grade," derives from the latin 'gradus,' meaning a step or degree, and here specifies a particular rank or standard of quality. the term's literal logic is "of the rank or quality for a bomb," which evolved into the specific abstract meaning denoting the exceptionally high purity required for fissile material in nuclear weapons, distinguishing it from lower grades used for civilian purposes like reactor fuel.

Structure: bomb + grade bomb (from italian 'bomba', likely of onomatopoeic origin; functions as a noun used attributively to denote purpose). grade (from latin 'gradus', meaning 'step, degree'; functions as a noun meaning 'a level of quality or rank').