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overwhelm	to beat or defeat by greater force; destroy. [2 definitions]
overwork	to cause to work too many hours; tire completely with work. [3 definitions]
owe	to have to pay or repay; be in debt to. [2 definitions]
owl	a bird with large eyes set in front of a large head, a strong, hooked beak, and strong, sharp claws. Owls are most active at night and hunt other animals for food. There are many different kinds of owls.
own	belonging to oneself or itself alone. [4 definitions]
owner	a person who owns.
ownership	the state or fact of being an owner. [2 definitions]
ox	one of a breed of large cattle used on farms to pull heavy loads.
oxbow	a wooden collar in the shape of a U that goes around the neck of an ox. It is fastened to a yoke.
oxen	plural of "ox."
oxeye daisy	a daisy that has a bright yellow center with white petals around it.
oxford	a sturdy, plain shoe that laces over the top of the foot.
oxide	a compound that includes oxygen.
oxidize	to combine with oxygen. [2 definitions]
oxygen	a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O)
oyster	a small animal with a soft body and a hard shell in two pieces. Oysters have a rough shell with a very shiny inside, where pearls sometimes grow. Oysters live in shallow ocean water. They are mollusks and are closely related to clams and mussels. People eat some kinds of oysters.
oz.	abbreviation of "ounce" or "ounces."
ozone	a form of oxygen that occurs when oxygen is exposed to an electrical charge, like lightning. It is found naturally in Earth's atmosphere.
ozone hole	an area in the ozone layer where the ozone becomes thin. There is a large ozone hole over Antarctica and a smaller one over the North Pole. Scientists warn us this is dangerous.
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.
P²	symbol of the chemical element phosphorus.

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