former transliteration of the name of the Chinese capital city, now (in the pinyin system) called Beijing. In the Wade-Giles system it was Peiping; the form Peking pre-dates Wade-Giles and was formed by the old British-run, Hong Kong-based Chinese postal system. Peking duck, "large domestic duck of white plumage and orange beak and legs," is attested from 1880.

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Definitions of Peking from WordNet

Peking (n.)
capital of the People's Republic of China in the Hebei province in northeastern China; 2nd largest Chinese city;
Synonyms: Beijing / Peiping / capital of Red China