ac-pref.（前缀）Variant of ad- ad-的变体ad- pref.（前缀）1.ac- or af- or ag- or al- or ap- or as- or at- Toward; to.Beforec,f,g,k,l,p,q,s,and t,ad- is usually assimilated to ac-,af-,ag-,ac-,al-,ap-,ac...