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.
Flat roofs and roof details. A waterproofing system must adapt to the conditions on the flat roof, offer maximum design flexibility and perform its function without compromise. To put it simply, the roof must be watertight. Only an intelligent roof system can meet these requirements.