iris diaphragm

noun

: an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens

Examples of iris diaphragm in a Sentence

Recent Examples on the Web

The iris diaphragm is a mechanical solution rarely, if ever, seen in wristwatches. —Matthew Catellier, Forbes.com, 30 Apr. 2025

Word History

First Known Use

1867, in the meaning defined above

Rhymes for iris diaphragm

• clonazepam
• diazepam
• ideogram
• malayalam
• oscillogram
• roentgenogram
• abraham
• anagram
• cablegram
• cofferdam
• dendrogram
• diagram

Kids Definition

iris diaphragm

noun

: an adjustable diaphragm of thin plates used for changing the diameter of a central opening to control the amount of light passing (as into a microscope or camera)

Medical Definition

iris diaphragm

noun

: an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens (as in a microscope)