■ adjective denoting a type of plug, and the corresponding socket, used with audio and video equipment, in which one conductor is cylindrical and the other is a central prong that extends beyond it.
Origin
1940s: abbrev. of ~graph .
PHONO
Meaning of PHONO in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004