Google Finance today launched "Dictionary function" feature for the financial terms at the top of the company page. To see the definitions, go to a company page on Google Finance and hover your mouse over the financial ratios beside the stock price.
Google says "they've received over 3,700 ideas and 38,000 votes, when asked readers about what new features you wanted to see on Google Finance. And, Dictionary function is one of the top 10 requests with over 700 votes."
If you're curious to see all ideas that were submitted, take a look through Google Finance Product Ideas.