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.
Etymology: AS, niwe, new, boren, to bear. a human infant from the time of birth through the 28th day of life. At birth, the gestational age and birth weight are assessed and the newborn classified accordingly, for example, large for gestational age, preterm (premature), or low birth weight. Also called neonate, newborn infant.