| carbohydrate |
A carbohydrate is one kind of substance that makes up food. Protein and fat are the two other kinds of substances that are in food. Carbohydrates are found mainly in plants. There are a lot of carbohydrates in fruit, sugar, potatoes, bread, and other foods made from grain. The body uses carbohydrates to make energy. If the body doesn't need the energy right away, the carbohydrates are stored in the body. [2 definitions] |
| carbon |
When wood or paper is burned with little or no air around it, it sometimes leaves behind a black substance. This substance is called carbon. [1/2 definitions] |
| 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] |
| charcoal |
Charcoal is the solid, black substance that is created when wood is burned with very little air around it. When a piece of wood becomes charcoal it still looks like a piece of wood but it is very black and very light in weight. Charcoal itself burns very well, and it can make very high heat. [1/2 definitions] |
| chemical |
a substance used in or produced by a chemical process. [1/3 definitions] |
| chewing gum |
Chewing gum is something like candy, but you don't eat it. It is a soft, sweet substance that you enjoy chewing in your mouth. You chew it for a long time, but you don't swallow it. |
| 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) |
| chlorophyll |
Chlorophyll is a green substance that exists in the leaves and stems of plants. Chlorophyll is very important because it makes it possible for plants to produce food for themselves using sunlight. |
| 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. |
| cleaner |
A cleaner is a person or thing that cleans. A cleaner for things is often a liquid or powder substance, but it can also be a machine of some kind. |
| coal |
a hard black or dark brown substance that is found in the earth and burned as fuel. [1/2 definitions] |
| coat |
When you coat something, you cover it with a layer of some substance. [1/4 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] |
| cosmetic |
A cosmetic is a substance that people use to make themselves look nicer. People often use cosmetics on their skin, nails, or face. Things like nail polish, skin cream, and lipstick are cosmetics. |
| cream |
A cream is also what we call a thick, smooth substance that people use on their skin. It makes their skin feel better or look nicer. [1/3 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] |