As if the oceans needed more terrible news, scientists have learned that the coral reefs surrounding the Florida Keys are dissolving. The culpritâocean acidificationâwasnât expected to start hitting reefs hard for another three decades.
index noun (LIST) C1 [ C ] an alphabetical list, such as one printed at the back of a book showing which page a subject, name, etc. is on: Try looking up heart disease in the index. âº [ C ] a collection of information stored on a computer or on a set of cards, in alphabetical order:
A stock index is a measure of the overall performance of a stock market, based on a group of stocks that are meant to represent the market as a whole. The Dow Jones Industrial Average, or Dow, is one of the most common stock indexes used to gauge the performance of the U.S. stock market.