3 entries found for reaction.
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reaction chain reaction immune response

Main Entry: re·ac·tion
Pronunciation: r-ak-shn
Function: noun
1 a : the act or process or an instance of reacting <our reaction to the news> b : an action or attitude opposing current political or social forces or ideas
2 : a bodily response to a stimulus; especially : the response of the body to a foreign substance (as a drug)
3 : the force that opposes the action of a force applied to one body by another body
4 a : chemical transformation or change : the action between atoms or molecules to form one or more new substances b : a process involving change in atomic nuclei