Reaction, chemical

A process in which one substance is transformed into another. Thousands of different types of chemical reactions occur in the body and are essential to its structure and function.

Medical dictionary. 2011.

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  • reaction — reactional, adj. reactionally, adv. /ree ak sheuhn/, n. 1. a reverse movement or tendency; an action in a reverse direction or manner. 2. movement in the direction of political conservatism or extreme rightism. 3. action in response to some… …   Universalium

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