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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| castor1 (ˈkɑːstə) | |
| —n | |
| 1. | the brownish aromatic secretion of the anal glands of a beaver, used in perfumery and medicine |
| 2. | the fur of the beaver |
| 3. | a hat made of beaver or similar fur |
| 4. | a less common name for beaver |
| [C14: from Latin, from Greek kastōr beaver] | |
| Castor (ˈkɑːstə) | |
| —n | |
| 1. | the second brightest star, Alpha Geminorum, in the constellation Gemini: a multiple star consisting of six components lying close to the star Pollux. Distance: 52 light years |
| 2. | classical myth See Castor and Pollux |
| Castor (kās'tər) Pronunciation Key
A bright multiple star in the constellation gemini, with a combined apparent magnitude of 0.08. Scientific name: Alpha Geminorum. |