primary winding(n = noun.artifact) primary, primary coil - coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit; "current through the primary coil induces current in the secondary coil"
is a kind of coil
is a part of transformer

closed primary, direct primary, field winding, open primary, primary, primary amenorrhea, primary atypical pneumonia, primary care, primary care physician, primary cell, primary censorship, primary coil, primary dentition, primary dysmenorrhea, primary election, primary feather, primary health care, primary quill, primary school, primary sex character, primary sex characteristic, primary sexual characteristic, primary solid solution, primary syphilis, primary tooth, ring winding, secondary winding, series winding, shunt winding, winding