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bi·gua·nide | \ (ˈ)bī-ˈgwän-ˌīd, -əd 
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\Medical Definition of biguanide
: a strong base C2H7N5 that is soluble in water and alcohol also : any of various derivatives of this base including some (such as chlorhexidine) that are used as antiseptic and disinfecting agents and others (such as metformin) that are used in the treatment of type 2 diabetes — see proguanil
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