X-

• x-axis • x-linked • x-linked dominant inheritance • x-linked gene • x-linked recessive inheritance • x-linked scid • x-or circuit • x-radiation • x-rated • x-ray • x-ray astronomy • x-ray diffraction • x-ray film • x-ray machine • x-ray photograph • x-ray photography • x-ray picture • x-ray therapy • x-ray tube • x-raying • x-scid