Greek roots

3. a device that regulates temperature.
4. an instrument that measures the distance traveled by a vehicle.
5. relating to or caused by heat.
6. a form of carbon used in pencils for writing or drawing.
8. an instrument for measuring temperature.
10. the study of the Earth's physical features and the distribution of life on the planet.
13. the system and structure of a language.
14. relating to sight or light.
15. a gauge that measures and displays the speed of a vehicle.
16. an instrument used to observe distant objects.

1. a professional who examines eyes for visual defects and prescribes corrective lenses.
2. a signature or a person's handwritten name.
4. a person qualified to make and supply eyeglasses.
5. a message sent by telegraph and then delivered in written or printed form.
7. a simplified drawing showing the appearance, structure, or workings of something.
9. an optical instrument that allows observation from a concealed or protected position.
11. an instrument measuring atmospheric pressure.
12. a device used to see very small objects.