primary amenorrhea(n = noun.state) - delay of menarche beyond age 18;
is a kind of amenia, amenorrhea, amenorrhoea

amenorrhea, closed primary, direct primary, open primary, primary, 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, primary winding, secondary amenorrhea