Kalmar “anionic” sifa ce da ke bayyana wani abu ko nau’in sinadari mai ɗauke da caji mara kyau. A wasu kalmomi, nau'in anionic suna da wuce gona da iri na electrons, wanda ke haifar da caji mara kyau. Anions yawanci suna samuwa ta hanyar samun ɗaya ko fiye da electrons ta hanyar zarra ko kwayoyin halitta, ko ta asarar proton daga acid. Misalan nau'in anionic sun haɗa da ions chloride (Cl-), ions sulfate (SO42-), da ions hydroxide (OH-). Ana amfani da mahadi na Anionic a fannoni daban-daban na sinadarai, kamar a cikin wanki, surfactants, da electrochemistry.