10. 
    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 op http://antoine.frostburg.edu/chem/senese/101/glossary/o.shtml
    
    
11. 
    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 op http://www.encyclo.co.uk/local/20747
    
    
12. 
    Oxygen
    Gas that makes up one fifth of the air we breathe. Oxygen is essential for life.
    Found op http://www.cancerhelp.org.uk/utilities/glossary/index.htm?search=o
    
    
13. 
    Oxygen
    A gas in the air used in aerobic respiration and produced in photosynthesis
    Found op http://www.makingsenseofhealth.org.uk/default.html?section=Secondary&chapte
    
    
14. 
    Oxygen
    a gas that is colourless, odourless, and tasteless; essential to almost all forms of life
    Found op http://www.medichecks.com/glossary.cfm?ltr=O
    
    
15. 
    Oxygen
    Oxygen is an odourless, colourless gas that makes up about 20% of the air we breathe.
    Found op http://www.nhs.uk/Conditions/Pages/hub.xhtml
    
    
16. 
    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 sym...
    Found op http://www.medterms.com/script/main/art.html?articlekey=10690
    
    
17. 
    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, od...
    Found op http://www.encyclo.co.uk/webster/O/62
    
    
18. 
    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...
    Found op http://www.mondofacto.com/facts/dictionary?oxygen
    
    
19. 
    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 crus...
    Found op http://wordnetweb.princeton.edu/perl/webwn?s=oxygen
    
    
20. 
    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 op http://www.encyclo.co.uk/local/21001
    
    
21. 
    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.
    Found op http://thinkexist.com/dictionary/meaning/oxygen/
    
    
22. 
    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 op http://www.britannica.com/eb/a-z/o/43
    
    

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