noun
Beijing dialect; Pekingese
Refers specifically to the dialect of Mandarin Chinese spoken in Beijing, which forms the basis of Standard Chinese (Putonghua).
彼は北京語を流暢に話す。
He speaks the Beijing dialect fluently.
中国語 is the general term for the Chinese language, whereas 北京語 is a specific regional dialect.
Compound of 北京 (Pekin, 'Beijing') and 語 (-go, 'language').