The missing word from the text is: "litanies". Hence the sentence in full reads: In "Araby," James Joyce references the repetitive chants or litanies recited by shopboys who stood guard next to barrels of pig's cheeks.
A litany is a form of prayer that is made during services and processions. It comprises of several petitions.
The missing word in the above text is gotten by the hint that was included. The hint was repetitive chants.
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