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 Ratings. Since every manufacturer seems to have their own definition of what constitutes waterproof, we wanted to present you with a simple way to compare the level of water-tightness across products and manufacturers.