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| alcohol |
any of a class of volatile organic compounds derived from hydrocarbons in which one or more hydroxyl groups replace one or more hydrogen atoms of the parent hydrocarbon. [1/3 definitions] |
| aldehyde |
in chemistry, any of a group of organic compounds, such as formaldehyde, the molecule of which contains a terminal carbon atom bound separately to a hydrogen and an oxygen atom. |
| -amine |
containing the amino group, which has one atom of nitrogen and two of hydrogen. |
| amine |
any of a group of ammonia derivatives in which hydrogen atoms have been replaced by organic groups containing hydrogen and carbon. |
| amino |
of, relating to, or containing an amine or other chemical substance formed by anitrogen-hydrogen group in combination with nonacidic organic compounds. |
| ammonia |
the pungent gas formed from the chemical combination of nitrogen and hydrogen, used esp. in refrigeration and in making fertilizers. [1/2 definitions] |
| ammonium |
the ion resulting from the chemical combination of ammonia and a hydrogen ion. |
| antihydrogen |
the antimatter counterpart of hydrogen. |
| benzene ring |
the graphic representation of the benzene molecule or its derivatives as a hexagon with a carbon atom at each of its six points, and with attached atoms of hydrogen or other elements. |
| big bang theory |
the theory that the universe originated at a fixed point billions of years ago in a cosmic explosion of a mass of hydrogen atoms, and that it has been expanding ever since. (Cf. steady state theory.) |
| bitartrate |
an acid tartrate having only one of the two acidic hydrogen atoms of tartaric acid. |
| carbohydrate |
any of a class of organic compounds including sugars, starches, and celluloses that are formed of carbon, hydrogen, and oxygen and that are important in plants and necessary to animal and human nutrition. [2 definitions] |
| carboxyl |
a chemical group containing one atom of carbon, two of oxygen, and one of hydrogen, present in many organic acids. |
| chelate |
in chemistry, of or designating a ring compound that has one or more hydrogen bonds. [2/7 definitions] |
| chemistry |
the science that studies the structures, functions, transformations, and interactions of basic elements, as, for example, carbon, oxygen, hydrogen, and sodium, as well as complex substances that combine basic elements. [1/4 definitions] |
| chromosphere |
a layer of gas, mostly hydrogen, that surrounds a star, esp. the sun, above the photosphere and below the corona. |
| dehydrogenase |
an enzyme that catalyzes the removal of hydrogen atoms from a molecule. |
| dehydrogenate |
to remove hydrogen from (a chemical compound). |
| deuterium |
an isotope of hydrogen that has one proton and one neutron in each nucleus; heavy hydrogen. (Cf. protium, tritium.) |
| dibasic |
designating an acid having two replaceable hydrogen atoms. [1/2 definitions] |
| ether |
a very volatile, flammable liquid compound of hydrogen, carbon, and oxygen, used as a solvent and formerly as an anesthetic. [1/4 definitions] |
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