| horizontal |
parallel to the surface of the earth or to the horizon. |
| hormone |
a substance made by certain cells in the body. Hormones move around the body in the blood and have effects on certain organs and cells. Hormones help control body processes such as growth. |
| horn |
a hard, hollow growth on the head of certain mammals. Deer, cows, and sheep are some animals that have horns. Horns usually grow in pairs. [3 definitions] |
| horned lizard |
a lizard with a short tail and short legs that eats insects; horned toad. It lives in the western part of the United States and in Mexico. The horned lizard has spines that look like horns on its head and rough scales and spines on its body. |
| horned toad |
another name for horned lizard. |
| hornet |
a large, stinging insect that is a kind of wasp. Hornets live together in groups called colonies. They build large, round nests from a material that looks like paper. |
| horny |
having horns or hornlike projections. [3 definitions] |
| horrible |
causing a feeling of fear, horror; dreadful. [2 definitions] |
| horrid |
causing a feeling of horror; dreadful; frightening. [2 definitions] |
| horrify |
to cause feelings of horror in; frighten, shock. |
| horror |
a great and painful feeling of fear or shock. [3 definitions] |
| horse |
a large mammal with long legs and hooves. A horse has a long neck with a mane, short hair, and a long tail. In the wild, horses live in herds and eat grass and other plants. For thousands of years, people have used horses for riding and for pulling or carrying loads. [3 definitions] |
| horse around |
to play in a silly or foolish way; to be very active. |
| horseback |
the back of a horse. [2 definitions] |
| horsefly |
a large fly that is sometimes found in large numbers around horses, cows, or other animals. Female horseflies bite and feed on the blood of people and animals. |
| horseman |
a man who rides on a horse. [2 definitions] |
| horseplay |
rough or noisy play. |
| horsepower |
a unit of energy equal to 746 watts or the energy needed to lift 550 pounds in one second, used in measuring the power of engines. (abbreviated: hp) |
| horseshoe |
a narrow, flat piece of iron shaped like a U that is fitted and nailed to a horse's hoof. [2 definitions] |
| horsewoman |
a woman who rides on a horse. [2 definitions] |
| hose |
a flexible tube of rubber or plastic through which a liquid can pass. [3 definitions] |