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What a Prefix Does to a Term

This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.

State

A prefix modifies a medical term by position, direction, number, time, speed, or negation, without changing what kind of term it is.

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Carditis is inflammation of the heart; pericarditis places that inflammation around the heart.

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Most medical terms carry no prefix. Its absence is not a missing piece.