| rabies |
a disease that is caused by a virus and can kill people, dogs, and other mammals. Symptoms of rabies are foaming at the mouth and violent or strange behavior. A person can get rabies if scratched or bitten by an animal that has the disease. |
| raccoon |
a small mammal with brown and gray fur, a long tail with black rings, and a pointed face with black markings that look like a mask. Raccoons eat plants and small animals such as insects and frogs. In towns and cities, they eat garbage. Several kinds of raccoons live in North and South America and on Caribbean islands. |
| race1 |
a sport or contest of speed. [7 definitions] |
| race2 |
a human population sharing certain common physical characteristics that have been passed down from one generation to the next. [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 |
the sport of competing with others to be the fastest, especially in driving a car or riding a horse. |
| racism |
the opinion or belief that a particular race of people is better than another race or races. [2 definitions] |
| racist |
believing, implying, or claiming that one race of human beings is superior to another or others. [3 definitions] |
| rack1 |
a frame or stand used to hold, hang, or show things. [4 definitions] |
| racket1 |
a loud, confusing noise. [2 definitions] |
| racket2 |
an object used to hit the ball in tennis and similar sports. It is made of a round or oval frame with a network of tightly laced strings and 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 |
the use of radio waves to track the location, distance, and speed of faraway objects. Waves are sent out and then picked up again when they bounce back after hitting some object. [2 definitions] |
| 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] |
| radiation |
the waves of energy sent out by sources of heat or light, or by radioactive material. |
| radiator |
a device that uses steam or hot water passing through pipes in order to heat a room. [2 definitions] |
| radical |
having to do with the root or source; basic; fundamental. [4 definitions] |
| radii |
a plural of "radius." |