Function: noun
Date: 1950
: a turnable control device (as for a camera diaphragm opening) that engages with a definite click at specific settings
Function: noun
Date: 1950
: a turnable control device (as for a camera diaphragm opening) that engages with a definite click at specific settings
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012