Dictionary.net

• chow'-chow, n. a mixture of food such as the Chinese use, e.g. preserved pickles.--adj. miscellaneous, mixed. [Pigeon-English.]

1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson

• Chinese preserve of orange-peel, ginger, &c.

1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry