syndrome in males resulting from a genetic defect in which an extra female X chromosome (thus an XXY genotype) is present in a male, characterized by small testes, long legs, enlarged breasts, reduced sperm production, and mental retardation, meeste geneetiline defekt, mille puhul spetsiifiline naisele omane X-kromosoom esineb mehel, põhjustades väikseid munandeid, laiu õlgu, suurenenud rindu, sperma vähesust ja mentaalsete protsesside aeglustumist