Ma'anar ƙamus na kalmar "lymphocyte" wani nau'in farin jini ne wanda shine muhimmin sashi na tsarin rigakafi. Ana samar da Lymphocytes a cikin kasusuwa kuma ana samun su a cikin jini da nama na lymphatic. Suna taka muhimmiyar rawa wajen kare jiki daga kamuwa da cututtuka ta hanyar ganewa da kuma kai hari ga mahara na kasashen waje, kamar kwayoyin cuta, ƙwayoyin cuta, da kwayoyin cutar kansa. Akwai manyan nau'ikan lymphocytes guda biyu: Kwayoyin B, waɗanda ke samar da ƙwayoyin rigakafi, da ƙwayoyin T, waɗanda ke kai hari kai tsaye ga ƙwayoyin cuta ko masu cutar kansa.