| arsenic |
a poisonous substance that is one of the chemical elements. It can be either grayish white, yellow, or black. (symbol: As) |
| bromine |
a poisonous, dark reddish brown liquid that is one of the chemical elements. It evaporates quickly and combines easily with other elements. (symbol: Br) |
| carbon monoxide |
a poisonous gas with no color or smell. Carbon monoxide forms when a material containing carbon, like gasoline, is not fully burned because of too little air. |
| 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) |
| fluorine |
a substance that is a chemical element. Fluorine combines easily with other elements to form compounds. Some of these compounds are used to prevent tooth decay. Fluorine is poisonous in its pure gas form. (symbol: F) |
| hemlock |
a poisonous plant that has a hollow stem and small white flowers. [1/2 definitions] |
| iodine |
a substance that is one of the chemical elements. Iodine combines easily with other elements. It is found in salt water and seaweed. Iodine is poisonous in its pure crystal form. (symbol: I) [1/2 definitions] |
| mask |
a covering for the mouth and nose to protect the wearer from germs, poisonous gases, dust, or the like. A mask is also used to protect other people from one's own germs. Some kinds of masks are used to provide oxygen or other breathable gas to the wearer through an attached tube. [1/6 definitions] |
| mistletoe |
a poisonous, evergreen plant that has white berries and small, yellow flowers. Mistletoe is a parasite that grows on trees. [1/2 definitions] |
| mushroom |
a fungus with a stalk and a cap that looks like a small umbrella. Some kinds of mushrooms can be eaten; other kinds are poisonous. Mushrooms live in damp places and are the fruiting bodies of certain kinds of fungi. [1/3 definitions] |
| nicotine |
a poisonous substance found in the tobacco plant. Nicotine is what causes people to become addicted to cigarettes. |
| phosphorus |
a substance that is a chemical element. One of the common forms of phosphorus is a poisonous yellow solid that glows in moist air. Phosphorus is important to living things. It is used in fertilizers to help plants grow. (symbol: P) |
| poisonous |
When something is poisonous, it can cause great harm if it is touched or eaten. It can hurt animals, people, or plants very much. Some poisonous things can even kill. |
| reaction |
A reaction is a feeling or action that comes immediately after something else and is caused by it. When some people suddenly see a big spider, their reaction is to scream or jump away. When someone touches a poisonous plant, their skin's reaction is usually to become itchy, very hot, or painful. [1/2 definitions] |
| rhubarb |
a plant with long green or reddish stalks, which are often cooked with sugar and eaten in pies and other desserts. The leaves of rhubarb are poisonous. |
| toadstool |
a mushroom shaped like an umbrella. Toadstools are often poisonous. |
| toxic |
having to do with or caused by a toxin; poisonous. [1/2 definitions] |
| yew |
an evergreen tree or shrub that has sharp, flat needles and poisonous red berries. [1/2 definitions] |