PROM
WordNet
noun
(1) A formal ball held for a school class toward the end of the academic year
WiktionaryText
- programmable read-only memory: A PROM chip can be programmed one or more times (depending on the type) and generally cannot be re-programmed without special equipment. Once programmed and installed in a device, it functions as a read-only chip (as if it had been hard-wired to function that way.)