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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a stew of meat, vegetables, potatoes, etc. |
see definition
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seeing
in astronomy, sharpness of a telescopic image. Seeing is dependent upon the degree of turbulence in the Earth's atmosphere for a given telescope. Scintillation, the "twinkling" of stars to the unaided eye, is a commonly known result of turbulence in the higher reaches of the atmosphere. Poor seeing in telescopes is more a result of turbulence in the lower atmosphere. This turbulence sets a limit on the features that a telescope can resolve.
Learn more about seeing with a free trial on Britannica.com.