oxygen

(Humans as organisms) gaseous element making up about 20% of the air, which is needed by living organisms for respiration

oxygen

[n] - a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas
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Oxygen

Oxygen is a colourless, odourless gas. It is represented by the symbol O. It's most important property for use in industrial processes is that it supports combustion. Oxygen forms 21% by volume of the atmosphere. Oxygen has a relative density of 1.105.
Found on http://www.bocindustrial.co.uk/bocindustrial/technical/glossary/o.html

Oxygen

A colourless and odourless element that is essential for most life forms on earth. The name is derived from the French oxygène, which means 'acid generating'. Symbol O Also known as Vital air.Discovered1774 Priestley publishes his work on oxygen.AbundanceThe most abundant element on earth, making up about 1/5 of the earth's atmosphere and 8/9ths o...
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Oxygen

O a common gaseous element, occurring naturally in the air, water, and most minerals and organic substances, essential to the reciprocal processes of plant and animal life. Highly reactive combining with other atoms, molecules and compounds through a process known as burning. Exists in the air as free molecules O2 (O3 = ozone), and also dissolv...
Found on http://www.encyclo.co.uk/local/20722

oxygen

(O) Element 8, atomic weight 15.9994, a colorless, odorless gas that makes up about 1/5 of the earth's atmosphere and (in combined form) 8/9ths of earth's oceans and almost half of the earth's crust. The name is derived from the French oxygène, which means 'acid generating'.
Found on http://antoine.frostburg.edu/chem/senese/101/glossary/o.shtml

Oxygen

A gaseous element which makes up approximately 20% of the earths atmosphere. It is usually found in the molecular ... form. Oxygen is the most abundant element on earth
Found on http://www.encyclo.co.uk/local/20747

Oxygen

Gas that makes up one fifth of the air we breathe. Oxygen is essential for life.
Found on http://www.cancerhelp.org.uk/utilities/glossary/index.htm?search=o

Oxygen

a gas that is colourless, odourless, and tasteless; essential to almost all forms of life
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Oxygen

Oxygen is an odourless, colourless gas that makes up about 20% of the air we breathe.
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Oxygen

Oxygen: A colorless, odorless and tasteless gas that makes up about 20% of the air we breathe (and at least half the weight of the entire solid crust of the earth) and which combines with most of the other elements to form oxides. Oxygen is essential to human, animal and plant life. The chemical symbol for the element oxygen is O. As a medicinal ga...
Found on http://www.medterms.com/script/main/art.asp?articlekey=10690

Oxygen

Ox'y·gen noun [ French oxygène , from Greek ............ sharp, acid + root of ............ to be born. So called because originally supposed to be an essential part of every acid .] 1. (Chemistry) A colorless, tasteless, odorless, gaseous element occurring in the free stat...
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oxygen

1. <chemistry> A colourless, 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. ... It occurs combined in immense quantities, forming eight ninths by weight of wat...
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oxygen

O noun 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
Found on https://www.encyclo.co.uk/local/20974

oxygen

(O) (ok´sĭ-jәn) a chemical element, atomic number 8, atomic weight 15.999. It is a colorless and odorless gas that makes up about 20 per cent of the atmosphere. In combination with hydrogen, it forms water; by weight, 90 per cent of water is oxygen. It is the third most abundant of all ...
Found on http://www.encyclo.co.uk/local/21001

Oxygen

• (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. • (n.) Chlorine used in bleaching.
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oxygen

nonmetallic chemical element of Group VIa of the periodic table. Oxygen is a colourless, odourless, tasteless gas, the most plentiful element in the ... [108 related articles]
Found on http://www.britannica.com/eb/a-z/o/43

oxygen

oxygen A colorless, odorless, tasteless gas that is the most abundant element on earth, making up about 20% by volume of the atmosphere at sea level, about 50% of the material of the earth`s surface, and about 90% of water. Oxygen is necessary for the life processes of nearly all living organisms and for most forms of combustion. It readily forms ...
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oxygen

A colorless, tasteless, odorless gas that is the second most abundant constituent of dry air, comprising 20.946%.
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oxygen

(O) Oxygen atom Credit: NASA/World Book A colorless, odorless, gaseous element, the most abundant in Earth's crust (49.2% by mass) and the second most abundant in the atmosphere (28% by volume). Free oxygen is essential to the survival of all aerobic organisms. Oxy...
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oxygen

A gaseous element that constitutes about 21 percent of the air we breathe. Elemental molecular oxygen consists of two oxygen atoms bonded together. A photochemical reaction of oxygen is (ultimately) responsible for the production of ozone in the stratosphere. Oxygen concentrations found in ice core ...
Found on http://www.daviddarling.info/encyclopedia/O/AE_oxygen.html

oxygen

oxygen, gaseous chemical element; symbol O; at. no. 8; at. wt. 15.9994; m.p. -218.4°C; b.p. -182.962°C; density 1.429 grams per liter at STP; valence -2. The existence and properties of oxygen had been noted by many scientists before the announcement of its isolation by Priestley in 1774. Sc...
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Oxygen

Oxygen is an element that is found free as a colourless, odourless, tasteless gas in the atmosphere, of which it constitutes 21%. It is found in water, most rocksand minerals, and in numerous compounds; it is capable of combining with all of the elements, except for the inert gases; it is active in physiological processes and especially in combusti...
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oxygen

(O) Type: Term Pronunciation: ok′si-jen Definitions: 1. A gaseous element, atomic no. 8, atomic wt. 15.9994 on the basis of 12C = 12.0000; an abundant and widely distributed chemical element, which combines with most other elements to form oxides and is essential to animal and plant life. 2. The molecular form of oxygen, O
Found on http://www.medilexicon.com/medicaldictionary.php?t=64236

oxygen

Colourless, odourless, tasteless, non-metallic, gaseous element, atomic number 8, relative atomic mass 15.9994. It is the most abundant element in the Earth's crust (almost 50% by mass), forms about 21% by volume of the atmosphere, and is present in combined form in water and many other substances. Oxygen is a by-product of phot...
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