A suffix used to form the names of enzymes. It is often added to the name of the compound that the enzyme breaks down, as in lactase, which breaks down lactose. It is also added to a word describing the enzyme's activity, as in transferase, which catalyzes the transfer of a chemical group from one molecule to another, or reductase, which catalyzes the reduction of an organic compound.
Traditionally, the second largest stock exchange in the United States, after the New York Stock Exchange. The American Stock Exchange is in New York City. It is often identified in financial pages as AMEX. In 1998, AMEX merged with the NASD, which runs the NASDAQ exchange.