oxygen

n. nonmetallic diatomic element that is normally colorless odorless and tasteless and which is the most abundant element and is essential to life

In science, oxygen (IPA: ) is a chemical element with the chemical symbol O and atomic number 8. The word oxygen derives from two roots in Greek, οξύς (oxys) (acid, lit. sharp) and -γενής (-genēs) (producer, lit. begetter). It was recognized in 1777 by Antoine Lavoisier, who coined the name oxygen from the Greek roots mentioned above because he erroneously thought that it was a constituent of all acids. (The definition of acid has since been revised). Oxygen has a valency of 2. On Earth it is usually bonded to other elements covalently or ionically. Examples for common oxygen-containing compounds include water (H2O), sand (silica, SiO2), and rust (iron oxide, Fe2O3).
See more at Wikipedia.org...

Noun
1. a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
(synonym) O, atomic number 8
(hypernym) chemical element, element
(hyponym) liquid oxygen, LOX
(substance-holonym) water, H2O
(derivation) oxygenate, oxygenize, oxygenise, aerate

(n.)
Chlorine used in bleaching.
  

(n.)
A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96.
  

Oxygen The physical elements are merely the grossest manifestations or reflections on this material plane of invisible, intangible spiritual originants. In this context, all the matter in the universe can be reduced to four substantial elements: carbon, hydrogen, oxygen, and nitrogen. In the first manifested triad -- Mother, Father-Son-Husband, Son -- Oxygen corresponds to Father-Son-Husband; thus, the names of the chemical elements are also used to denote the subtler, more ethereal or spiritual elements from which they proceed.
"We would call hydrogen and oxygen (which instills the fire of life into the 'Mother' by incubation) in the pregenetic and even pre-geological ages -- the Spirit, the noumenon of that which becomes in its grossest form oxygen and hydrogen and nitrogen on Earth -- nitrogen being of no divine origin, but merely an earth-born cement to unite other gases and fluids, and serve as a sponge to carry in itself the breath of LIFE -- pure air" (SD 1:626). Oxygen corresponds to vitality or prana in the lower quaternary of human principles. Moreover, an elixir of life is said to be produced alchemically from ozone, an allotrope of oxygen (SD 1:144).