Noun
a tubular attachment used to keep stray light out of the lens of a camera
Source: WordNetThe pursuit of premium quality extends to the high-precision finish of the metal lens hood, and multiplies the pleasure of ownership. Source: Internet
The included lens hood is carbon fiber, so it doesn't add a lot of weight to the front of the lens, while at the same time protecting the front element and blocking stray light from hitting the lens from odd angles. Source: Internet
When even more light is required or you're shooting with the lens hood attached, you can use a separately sold TTL flash. Source: Internet