| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| oxygen |
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| SYLLABICATION: | ox·y·gen |
| PRONUNCIATION: |   k s -j n |
| NOUN: | Symbol O A nonmetallic element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, and in many compounds such as water and iron ore. It combines with most elements, is essential for plant and animal respiration, and is required for nearly all combustion. Atomic number 8; atomic weight 15.9994; melting point -218.4°C; boiling point -183.0°C; gas density at 0°C 1.429 grams per liter; valence 2. See table at element. | | ETYMOLOGY: | French oxygène : Greek oxus, sharp, acid; see ak- in Appendix I + French -gène, -gen. | | OTHER FORMS: | ox y·genic (-j nk) —ADJECTIVE
oxy·geni·cal·ly —ADVERB
ox·yge·nous (k-sj-ns) —ADJECTIVE
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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