X chromosome
— Noun
– English
～ the sex chromosome that is present in both sexes: singly in males and doubly in females; "human females normally have two X chromosomes"
x-axis
— Noun
– English
～ the horizontal axis in a plane coordinate system
X-linked gene
— Noun
– English
～ a gene located on an X chromosome
X
— Noun
– English
～ the 24th letter of the Roman alphabet
X-ray machine
— Noun
– English
～ an apparatus that provides a source of X rays
X-ray film
— Noun
– English
～ photographic film used to make X-ray pictures
X-SCID
— Noun
– English
～ 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-linked recessive inheritance
— Noun
– English
～ 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