| 单词 | steradian |
| 释义 | steradian[ stuh-rey-dee-uhn ] / stəˈreɪ di ən / noun Geometry.a solid angle at the center of a sphere subtending a section on the surface equal in area to the square of the radius of the sphere. Abbreviation: sr Origin of steradianFirst recorded in 1880–85; ste(reo)- + radian Words nearby steradiansteptoe, step turn, step-up, stepwise, -ster, steradian, sterco-, stercobilin, stercolith, stercoraceous, stercoraceous vomiting Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for steradiansteradian / (stəˈreɪdɪən) / nounan SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radiusSymbol: sr Word Origin for steradianC19: from stereo- + radian Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for steradiansteradian [ stĭ-rā′dē-ən ] A unitless measure of solid angles. A solid angle projecting from the center of a sphere and cutting its surface has a measure ofsr2 steradians, where s is the surface area of the sphere cut out by the solid angle, and r is the radius of the sphere. See also radian. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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