酰胺又称酸酰胺,是具有官能团RnE(O)xNR′2(R和R′指H或有机基团)的化合物.最常见的是甲酰胺（有机酰胺）（n=1,E=C,x=1）,但已知许多其他重要类型的酰胺,包括磷酰胺（n=2,E=P,x=1和许多相关公式）和磺酰胺（E=S,x=2）.酰胺这个术语既指化合物的种类,也指官能团（RNE（O）XNR’2）.酰胺也可以指氨的共轭碱（阴离子H2N）或有机胺（阴离子R2N）.
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