Water is a transparent and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms. Its chemical formula is H2O, meaning that its molecule contains one oxygen and two hydrogen atoms, that are connected by covalent bonds.
1. recently born; called also neonatal. 2. newborn infant. postmature newborn (post-term newborn) post-term infant. premature newborn (preterm newborn) preterm infant.
A neonatal intensive-care unit (NICU), also known as an intensive care nursery (ICN), is an intensive-care unit specializing in the care of ill or premature newborn infants. The first American newborn intensive care unit, designed by Louis Gluck, was opened in October 1960 at Yale-New Haven Hospital, Connecticut.he definition of a neonatal intensive-care unit (NICU) according to the National Center for Statistics is a hospital facility or unit staffed and equipped to provide continuous mechanical ventilatory support for a newborn infant.