Venison originally meant the meat of a game animal but now refers primarily to the meat of antlered ungulates such as elk or deer (or antelope in South Africa). Venison can be used to refer to any part of the animal, so long as it is edible, including the internal organs. Venison, much like beef or pork, is categorized into specific cuts, including roast, sirloin, and ribs.

The word derives from the Latin venari, meaning "to hunt or pursue". This term entered the English language through Norman French venaison in the 11th century, following the Norman conquest of England and the establishment of Royal Forests.

Since it is unknown whether chronic wasting disease (CWD), a transmissible spongiform encephalopathy among deer (similar to mad cow disease, scientifically known as bovine spongiform encephalopathy), can pass from deer to humans through the consumption of venison, there have been some fears of dangerous contamination of the food supply from wild deer carrying CWD.

More Info: en.wikipedia.org