We've found 1 definition containing the term rein in (6.71 seconds):

«definition»  What does rein in mean?                stop or slow up one's horse or oneself by or as if by pulling the reins control and direct with or as if by reins stop or check by or as if by a pull at the reins

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		KIU	Kallikrein Inhibitory Units	Medical » Physiology
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