Essential nutrients refers to classes of nutrients found in food. Essential nutrients are simply those that are vital for the normal growth, maintenance and development of the body. There might be a slight confusion about essential nutrients that must be addressed.
Definition of waterproof for English Language Learners. : 1  designed to prevent water from entering or passing through. : 2  designed so that water alone will not remove it.
Waterproof means the bag can be submerged completely underwater for long periods of time, and there wonât be one single drop of water that enters the interior. Think of a balloon, completely sealed off from the outside world.