Try Our Apps


The saddest words

iris diaphragm

noun, 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 diaphragm
First recorded in 1885-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for iris diaphragm
Historical Examples
British Dictionary definitions for iris diaphragm

iris diaphragm

an 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 aperture Sometimes 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
Cite This Source

Word of the Day

Difficulty index for iris diaphragm

Few English speakers likely know this word

Word Value for iris

Scrabble Words With Friends

Nearby words for iris diaphragm