Sacred scriptural canon of Theraveda Buddhism (9)

I believe the answer is:

tripitaka

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'buddhism' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

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(Other definitions for tripitaka that I've seen before include "collection of Buddhist essentials" , "Buddhist literature" .)

I've seen this clue in The Times.

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