| chalk |
a substance made from natural chalk that is formed into round sticks that can be used to write or draw with, especially on a blackboard or on pavement. [1/3 definitions] |
| chemical |
a substance used in or produced by a chemical process. [1/3 definitions] |
| chlorine |
a substance that is one of the chemical elements. It combines with sodium to form table salt. It is also used in making bleach. Chlorine is poisonous in its pure gas form. (symbol: Cl) |
| chocolate |
a food substance that is made from ground cacao seeds. Chocolate is not sweet, but it is often used in candy and other sweet foods. It is also used in making certain kinds of sauces. [1/6 definitions] |
| cholesterol |
a white substance, found in the tissues of humans and animals, which acts to clean the bloodstream and surrounds certain nerves. Cholesterol is made in the body but can also be obtained from animal foods such as meat and cheese. |
| coal |
a hard black or dark brown substance that is found in the earth and burned as fuel. [1/2 definitions] |
| coke |
the carbon substance that is left after coal has been heated without air. Coke is used as a fuel for doing certain kinds of work in a factory. |
| composition |
a material or substance that is made up of other materials or substances. [1/5 definitions] |
| compound1 |
a substance formed by combining two or more chemical elements. [1/6 definitions] |
| congested |
filled with too many things or too much of a substance; clogged. |
| content1 |
the amount of a substance that is contained in something else. [1/4 definitions] |
| crystal |
a piece of a certain substance that is made when the substance changes from a liquid to a solid. In becoming solid, as when water turns to ice, this type of substance takes on a structure that has a repeating pattern of flat surfaces. These flat surfaces reflect light and can make the substance sparkle when looked at from different directions. [1/5 definitions] |
| curd |
(sometimes plural) a soft, thick substance taken from milk. Curds can be eaten or made into cheese. |
| cytoplasm |
the thick liquid substance that holds all the parts that are inside a cell. |
| deodorant |
a substance for stopping or covering up unpleasant odors. |
| deposit |
a large amount of a natural substance found beneath the ground. [1/7 definitions] |
| detergent |
a chemical substance in the form of a liquid or powder used for washing things. |
| diamond |
a clear mineral that is a crystal form of pure carbon. Diamonds are the hardest natural substance known. They are used in making jewelry and as tools for cutting hard materials. [1/5 definitions] |
| DNA |
a substance found in cells that contains information about the characteristics of a living thing. DNA plays a part in the passing on of characteristics from parent to offspring. "DNA" is an abbreviation of "deoxyribonucleic acid." |
| drug |
a substance used to cure or heal; medicine. [2/3 definitions] |
| dye |
a substance that is used to give color to cloth, hair, or other materials. [1/2 definitions] |