1. fed(n = noun.person) federal, federal official - any federal law-enforcement officer; Array
is a kind of agent, federal agent
2. fed(n = noun.group) federal reserve, federal reserve system, frs - 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; "the Fed seeks to control the United States economy by raising and lowering short-term interest rates and the money supply"
is a kind of central bank
fed, n. US sl. a federal official, esp. a member of the FBI.
Etymology:
abbr. of FEDERAL
fed, past and past part. of FEED.
Idiom:
fed up (or fed to death) (often foll. by with) discontented or bored, esp. from a surfeit of something (am fed up with the rain). fed-upness the state of being fed up.