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| bifocal |
of eyeglasses or contact lenses, having two sections in each lens, one correcting for near vision and one for distant vision. [1/3 definitions] |
| carbonyl |
a metal compound containing a radical of one atom of carbon and one of oxygen, or this radical itself. |
| cyanide |
a chemical compound that contains one carbon and one nitrogen atom together with another element such as potassium or sodium, both of which form extremely poisonous substances. [1/2 definitions] |
| deism |
the belief, based only on reason and on evidence in nature, and not on any supernatural revelation, in the existence of a god who created the universe. (Cf. theism.) |
| deuterium |
an isotope of hydrogen that has one proton and one neutron in each nucleus; heavy hydrogen. (Cf. protium, tritium.) |
| deuteron |
a particle composed of one proton and one neutron that is equivalent to the nucleus of a deuterium atom and that has a positive charge. |
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