What Does O2 Stand for in Science
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oxygen
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noun Chemistry.
a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; atomic weight: 15.9994; atomic number: 8; density: 1.4290 grams/liter at 0°C and 760 millimeter pressure.
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Origin of oxygen
First recorded in 1780–90; from French oxygène, equivalent to oxy- + -gène; see origin at oxy-1, -gen
OTHER WORDS FROM oxygen
ox·y·gen·ic [ok-si-jen-ik], /ˌɒk sɪˈdʒɛn ɪk/, ox·yg·e·nous [ok-sij-uh-nuhs], /ɒkˈsɪdʒ ə nəs/, adjective ox·y·gen·ic·i·ty [ok-si-juh-nis-i-tee], /ˌɒk sɪ dʒəˈnɪs ɪ ti/, noun
Words nearby oxygen
oxychromatic, oxycodone, oxycodone hydrochloride, OxyContin, oxyesthesia, oxygen, oxygen acid, oxygen affinity hypoxia, oxygenase, oxygenate, oxygenated hemoglobin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
How to use oxygen in a sentence
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Most carbohydrates have the same oxygen to hydrogen ratio as water.
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Her aunt eventually recovered, was taken off a ventilator and is home, though she still needs oxygen.
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Photosynthetic cyanobacteria that arose some 3 billion years ago, for instance, began terraforming the planet by emitting oxygen.
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Researchers found no benefit for hospitalized patients who didn't need extra oxygen.
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So extra oxygen in the atmosphere may have provided the conditions for large insects to evolve.
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The others are difficult to identify, since they reacted with other oxygen-bearing molecules in the soil.
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It reacts very readily with oxygen by burning smokelessly, with carbon dioxide and water as its byproducts.
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Their decay proceeded without a ready supply of oxygen, producing hydrocarbons like methane instead of oxygen-bearing molecules.
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As the heart pumps blood to the far reaches of the body, it requires its own blood flow to receive vital oxygen and nutrients.
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The brain, also an organ, is particularly sensitive to the loss of oxygen.
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In the lungs hemoglobin forms a loose combination with oxygen, which it readily gives up when it reaches the tissues.
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They are cells which have been highly differentiated for the purpose of carrying oxygen from the lungs to the tissues.
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Its most important compound is water, of which it forms one-ninth, the other eight-ninths consisting of oxygen.
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In the flowers, both by day and night, there is a constant absorption of oxygen, and evolution of carbonic acid.
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In the first case, the oil rapidly combines with the oxygen of the air, this being accompanied by great heat.
British Dictionary definitions for oxygen
noun
- a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). It is essential for aerobic respiration and almost all combustion and is widely used in industry. Symbol: O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m³; melting pt: –218.79°C; boiling pt: –182.97°C
- (as modifier) an oxygen mask
Derived forms of oxygen
oxygenic (ˌɒksɪˈdʒɛnɪk) or oxygenous (ɒkˈsɪdʒɪnəs), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for oxygen
n. Symbol O
An element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, combines with most elements, is essential for plant and animal respiration, and is required for nearly all combustion. Atomic number 8.
A medicinal gas used therapeutically for oxygen supplementation, containing not less than 99.0 percent, by volume, of O2.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for oxygen
O
A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. Atomic number 8; atomic weight 15.9994; melting point -218.8°C; boiling point -182.9°C; gas density at 0°C 1.429 grams per liter; valence 2. See Periodic Table.
Word History
In 1786, the French chemist Antoine Lavoisier coined a term for the element oxygen (oxygène in French). He used Greek words for the coinage: oxy- means "sharp," and -gen means "producing." Oxygen was called the "sharp-producing" element because it was thought to be essential for making acids. Lavoisier also coined the name of the element hydrogen, the "water-producing" element, in 1788. Soon after, in 1791, another French chemist, J. A. Chaptal, introduced the word nitrogen, the "niter-producing" element, referring to its discovery from an analysis of nitric acid.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Cultural definitions for oxygen
notes for oxygen
Oxygen is a waste product of green plants and photosynthesis.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
What Does O2 Stand for in Science
Source: https://www.dictionary.com/browse/oxygen
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