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Credo is a Latin word meaning "to trust" (e.g. credit, credentials), but cardio comes from the Greek word καρδία, meaning "heart". Now, that didn't quite answer your question, but I'm doubt that, based on the definitions and morphology, they do actually come from the same root.

However, the Latin word for "heart" is cors, cordis, so one would imagine that both the Latin and Greek for "heart" have a similar etymology (at some point in the past).

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12y ago

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