| r |
the eighteenth letter of the English alphabet. |
| Ra1 |
symbol of the chemical element radium. |
| rabbi |
A rabbi is a religious leader in the Jewish religion. A rabbi is a teacher of the religion and a spiritual adviser to the congregation. A rabbi also performs religious services and ceremonies such as weddings. |
| rabbit |
A rabbit is a small animal with soft fur, long ears, long back legs, and a short tail. |
| rabies |
Rabies is a serious disease that is caused by a virus and can kill people, dogs, and other mammals. A person can get rabies if scratched or bitten by an animal that has the disease. If a dog is acting in a scary way and has white foam around its mouth, it is very possible that it has rabies. Dogs and cats can get shots that protect them against rabies, and this also protects people from getting rabies from these dogs and cats. |
| raccoon |
A raccoon is an animal with brown and gray fur, and it has black rings around its tail. Raccoons have a pointed face with black marks that look like a mask around its eyes. A raccoon is a small animal, but it's usually bigger than a large cat. |
| race1 |
A race is a kind of competition, or contest. To win the competition, you have to be the fastest. People often run, ride horses, or drive cars in a race, but there are other kinds of races too. [6 definitions] |
| race2 |
A race is a large human group that shares certain common physical features, such as skin color. [2 definitions] |
| racer |
a person who takes part in races. [3 definitions] |
| racetrack |
a track or course used for racing. |
| racial |
having to do with a race of people. [2 definitions] |
| racing |
Racing is the sport of trying to be the fastest in some activity like driving a car or riding a horse. |
| racism |
Racism is the opinion or belief that a particular race of people is better than another race or races. Racism causes unfair treatment of people of different races. |
| racist |
believing, implying, or claiming that one race of human beings is superior to another or others. [3 definitions] |
| rack1 |
A rack is something people use to hold up things. Racks can be of many different shapes and sizes. In stores, we often see clothes on racks. You might have a rack in your kitchen to hold spices or a rack near your front door to hold hats and umbrellas. [3 definitions] |
| racket1 |
a loud, confusing noise. [2 definitions] |
| racket2 |
A racket is something used to hit the ball in tennis and similar sports. Part of it is a round or oval frame holding many tight, crossed strings. The other part of it is a long handle. |
| racquetball |
a game played by two or four players in a small court with four walls. The players use rackets to hit a rubber ball against the walls. |
| radar |
When people use radar, they use a kind of system that sends out invisible waves that travel through the air to track where and how far away other objects are, like when a ship uses radar to find where other ships are in the water. The ship sends waves out from its location. If the waves hit something, they bounce back to the ship that sent them. When the ship picks up the radar signals coming back, they can figure out where the object is and how far away it is. |
| radiant |
sending out heat or rays of light; shining brightly. [2 definitions] |
| radiate |
to come out in the form of rays or waves. [4 definitions] |