Knowledge center. Hyperthyroidism, also known as overactive thyroid, is a medical condition caused by an abnormally high level of thyroid hormone in the bloodstream. The thyroid gland produces an excessive amount of thyroid hormones.The thyroid gland is located in the neck.raves' disease. It is the most common cause. Graves' disease is an autoimmune condition in which the body's immune system mistakenly targets the thyroid gland and causes it to produce too much thyroid hormone.
DEFINITION of 'Federal Reserve Bank'. The central bank of the United States and the most powerful financial institution in the world. The Federal Reserve Bank was founded by the U.S. Congress in 1913 to provide the nation with a safe, flexible and stable monetary and financial system.
1. Federal Reserve System-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.. 1. (Banking & Finance) (in the US) a banking system consisting of twelve Federal Reserve Districts, each containing member banks regulated and served by a Federal Reserve Bank. It operates under the supervision of the Federal Reserve Board and performs functions similar to those of the Bank of England.