| A | B |
|---|
| hydrant | a large upright cylinder with a valve for drawing water |
| hydrogen | a colorless, odorless, gaseous element |
| dehydrated | taking water or moisture from |
| chronic | lasting a long time; suffering long from an illness |
| synchronize | occur at the same time; agree in time; exactly together |
| thermos | a container made with a vacuum between its inner and outer walls so that its contents remain hot or cold |
| thermometer | instrument for measuring the temperature of a body or of space |
| diameter | a line segment passing from one side through the center of a circle or a sphere to the other side |
| speedometer | instrument to indicate the speed of an automobile or other vehicle, and often the distance traveled |
| centimeter | a unit of length equal to 1/100th of a meter |
| hydrophobia | an abnormal fear of water |
| hydraulic | operated by the pressure of water or other liquids at rest or in motion |
| hydroelectric | generation of electricity by water power |
| chronicle | the history of events based on their time order |
| chronological | arranged in order of time; another word for time order |
| thermostat | an automatic device for regulating temperature, usually connected to an air conditioner or furnace |
| thermal | of or having to do with heat |
| geometry | a branch of math that studies the relationship op points, lines, angles, and surfaces of figures in space |
| barometer | instrument for measuring the pressure of air; used for predicting probable changes in the weather |
| symmetry | a regular, balanced arrangement on opposite sides of a line or plane or around the center or axis |
