xadj. being one more than nine ; Xn. street names for methylenedioxymethamphetamine ; Xn. the 24th letter of the Roman alphabet ; Xn. the cardinal number that is the sum of nine and one ; the base of the decimal system ; X chromosomen. the sex chromosome that is present in both sexes: singly in males and doubly in females ; X rayn. a radiogram made by exposing photographic film to X rays ; used in medical diagnosis ; X rayn. electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target ; x-axisn. the horizontal axis in a plane coordinate system ; X-linkedadj. relating to genes or characteristics or conditions carried on the X chromosome ; X-linked dominant inheritancen. hereditary pattern in which a dominant gene on the X chromosome causes a characteristic to be manifested in the offspring ; X-linked genen. a gene located on an X chromosome ; X-linked recessive inheritancen. hereditary pattern in which a recessive gene on the X chromosome results in the manifestation of characteristics in male offspring and a carrier state in female offspring ; X-linked SCIDn. SCID in male children resulting from mutation of a gene that codes for a protein on the surface of T cells that allows them to develop a growth factor receptor ; X-OR circuitn. gate for exclusive OR ; a circuit in a computer that fires only if only one of its inputs fire ; X-radiationn. obtaining images by the use of X rays ;
