| aircraft |
any man-made vehicle that can fly through the air, such as an airplane, helicopter, glider, or balloon. |
| apogee |
the point in the orbit of the moon or of a man-made satellite that is farthest from the earth. (Cf. perigee.) [1/2 definitions] |
| barrage |
a man-made obstruction placed in a waterway to slow the flow or increase the depth of the water; dam. [1/3 definitions] |
| birdhouse |
a man-made nesting structure for birds, usu. built to look like a house. [1/2 definitions] |
| canal |
a man-made waterway for transportation or irrigation. [1/3 definitions] |
| channel |
a long, narrow, man-made trench or natural waterway for irrigation, boating, or fishing, or that connects two larger bodies of water. [1/8 definitions] |
| culvert |
a man-made channel for drainage or the like that passes under a street or other thoroughfare. |
| drainage |
a natural or man-made system of drains. [1/3 definitions] |
| golem |
in Jewish folklore, a man-made and humanlike figure brought to life by supernatural, occult forces. |
| irrigate |
to water by artificial means, as by pumping and spraying, or by man-made channels from a natural source of water. [1/2 definitions] |
| irrigation |
the supplying of water to land by man-made means to aid in growing crops. [1/2 definitions] |
| lagoon |
a man-made pool, as for sewage or wastewater treatment. [1/3 definitions] |
| machine |
a man-made device, usu. driven by a motor or engine, with a system of interrelated parts that work together to perform a task. [1/6 definitions] |
| naturally |
in accordance with nature and not through a man-made process. [1/4 definitions] |
| ozone depletion |
a steady decline in ozone in Earth's stratosphere, or a springtime decline in stratospheric ozone in Earth's polar regions. The primary cause of ozone depletion is man-made chemicals, particularly chlorofluorocarbons (CFCs). |
| pan |
a depression in the earth, either natural or man-made. [1/6 definitions] |
| plate |
a thin sheet of a hard material, either natural or man-made. [1/10 definitions] |
| pod1 |
a natural or man-made container, usu. having a long, thin shape. [1/4 definitions] |
| resin |
a similar man-made substance used in plastics. [1/3 definitions] |
| satellite |
a man-made object that is sent into orbit around a planet or other heavenly body, usu. to gather or relay information. [1/5 definitions] |
| skyline |
the outline of natural or man-made structures against the sky. [1/2 definitions] |