A tine is a prong, or a point. When you were little, you may have lined up your peas on the tines of your fork despite your parents telling you not to play with your food.
The tines of a fork are what make it possible to spear pieces of food with it. Other objects with similarly sharp points can also be described as having tines — like a pitchfork or the antler of a deer. The pointed end on a dental tool is also called a tine. The origins of the word tine can be traced back to the Old English tind, which means "sharp point," and is related to the German word Zinne, or "pinnacle."