| abuse |
cruel or harmful treatment. [1/6 definitions] |
| accident |
an event that happens by chance, especially a harmful one. [1/2 definitions] |
| addict |
a person who depends on something, such as a drug, that is usually harmful and cannot be easily given up. [1/3 definitions] |
| bacteria |
Bacteria are very, very small living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people. They are important in making soil and helping people to digest food, for example. Some bacteria are harmful, though, and cause disease. |
| bacterium |
singular form of "bacteria." Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease. |
| bad |
not healthy; harmful. [1/10 definitions] |
| cyst |
a small pouch within body tissue that is filled with fluid or air. Some cysts are connected with serious disease, but most are not harmful at all. |
| danger |
a chance or likelihood that something bad or harmful may happen; peril; risk. [1/2 definitions] |
| disagree |
to have a harmful effect (usually followed by "with"). [1/3 definitions] |
| evil |
If someone is evil, they are very bad. An evil person can do any harmful thing and not care that they hurt other people. They may even wish to destroy other people. [1/3 definitions] |
| harmful |
When something is harmful, it can make bad things happen. A bite from a spider can sometimes be harmful. Eating food that is old or spoiled can be harmful too. |
| heroin |
a drug made from a substance found in certain plants. Heroin is addictive and harmful. It is against the law to make, use, or possess heroin in the United States. |
| ill |
evil; harmful; bad. [1/6 definitions] |
| impure |
mixed with something that is harmful; polluted or not pure. |
| ladybug |
a small, round beetle that is red or orange with black spots. Ladybugs eat aphids and other insects that are harmful to plants. |
| lead2 |
Lead is a very heavy, soft, silver-gray metal. Lead has many uses, but it can be harmful to people and animals if it gets into their bodies. [1/2 definitions] |
| malign |
to speak badly of or tell harmful lies about. |
| mischievous |
tending to behave in an annoying or mildly harmful way. [1/2 definitions] |
| outrageous |
extremely wrong or harmful. [1/2 definitions] |
| ozone layer |
an atmospheric layer between ten and twenty miles above the earth that contains a large amount of ozone, which absorbs certain types of harmful radiation from space. |
| pasteurize |
to heat for a certain length of time. Food and drinks are pasteurized in order to kill most of the harmful bacteria. |