| 单词 | iris diaphragm |
| 释义 | iris diaphragmnoun Optics, Photography.a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris. Origin of iris diaphragmFirst recorded in1885–90 Words nearby iris diaphragmiridotomy, iridous, Irina, iris, irisation, iris diaphragm, iris family, Irish, Irish boat, Irish bridge, Irish bull Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for iris diaphragmiris diaphragm nounan adjustable diaphragm that regulates the amount of light entering an optical instrument, esp a camera. It usually consists of a number of thin metal leaves arranged so that they open out into an approximately circular apertureSometimes shortened to: iris 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 |
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