FRS (Noun) — The central bank of the United States; incorporates 12 Federal Reserve branch banks and all national banks and state-chartered commercial banks and some trust companies. ex. "the FRS seeks to control the United States economy by raising and lowering short-term interest rates and the money supply"
FRS (Noun) — A radioactive element of the alkali-metal group discovered as a disintegration product of actinium.
FRS (Abbreviation) — Fellow of the Royal Society.