| chemical |
a distinct substance, such as an element or molecular compound, used in or obtained through a reaction involving atomic or molecular changes. [3 definitions] |
| chemical additive |
an artificial substance added in small amounts to another to improve, preserve, or otherwise alter it. |
| chemical element |
any of the more than 100 substances, such as hydrogen, carbon, uranium, and lead, that are made up of only one type of atom and which cannot be chemically separated into simpler substances. |
| chemical engineering |
the professional, scientific, or industrial use of chemistry and chemical products; technology of chemistry. |
| chemical-free |
of or pertaining to a product that does not contain artificial chemicals or is produced without the use of artificial chemicals. |
| chemical warfare |
the use of chemicals such as poisonous gases, fire bombs, and irritants in warfare. |
| chemiluminescence |
the production of light in certain chemical reactions at low temperatures. |
| chemin de fer |
a variation of the card game baccarat. |
| chemise |
an unfitted women's undergarment; shift. [2 definitions] |
| chemist |
one who is active or expert in the field of chemistry. [3 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. [4 definitions] |
| chemistry lab |
in a school, a place where students studying chemistry can observe chemical reactions and carry out small experiments. |
| chemo- |
chemical. |
| chemoreception |
the response of a sense organ or nerve ending to a chemical stimulus. |
| chemoreceptor |
a nerve ending or sensory organ, as of taste or smell, that responds to chemical stimulation. |
| chemosurgery |
the selective removal or destruction of tissue by chemical rather than surgical means. |
| chemosynthesis |
the synthesis of organic substances by an organism using energy provided by a chemical reaction. |
| chemotherapeutic |
of, pertaining to, or used in chemotherapy. |
| chemotherapy |
the science or practice of destroying disease-causing microorganisms or malignant tissue by use of chemicals, esp. toxic ones. |
| chemurgy |
the industrial development of new chemical products from organic raw materials, usu. farm products. |
| Cheng Tang |
first leader of the Shang dynasty of China, ruling in approximately the seventeenth century B.C.E. (exact dates contested). |