transcription, транскрипция: [ noun ]
Date: 1867
: 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
IRIS DIAPHRAGM
Meaning of IRIS DIAPHRAGM in English
Merriam-Webster's Collegiate English vocabulary. Энциклопедический словарь английского языка Merriam Webster. 2003