noun
radio operator; radioman
A person who operates radio equipment, especially in maritime, aviation, or military contexts. The term is somewhat dated; modern usage often prefers 通信士 or 無線通信士.
彼は船の無線技師として働いていた。
He worked as a radio operator on a ship.
無線技師の資格を取るには国家試験に合格する必要がある。
To obtain a radio operator's license, you need to pass the national exam.
Compound of 無線 (musen, 'wireless') and 技師 (gishi, 'engineer' or 'technician'). The term reflects early 20th-century usage when radio was referred to as 'wireless'.