from The Century Dictionary.
- noun An instrument for measuring the minute variations of temperature due to different conditions of the sky.
from the GNU version of the Collaborative International Dictionary of English.
- noun An instrument consisting in part of a differential thermometer. It is used for measuring changes of temperature produced by different conditions of the sky, as when clear or clouded.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun meteorology A device for measuring
temperaturevariations due to different atmospheric conditions, such as cloud or clear skies.
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Ancient Greek: αἰθήρ (aithēr, "air; ether") in combination with σκοπέω (skopéo, "examine, inspect").
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