X chromosome

Etymology
Named by Hermann Henking in 1890 from x (signifying the unknown) due to some baffling properties he had observed. The brief resemblance in the appearance of the X and Y chromosomes to the letters "X" and "Y" respectively during cell division is entirely coincidental.

Noun

 * 1)  A mammalian sex chromosome. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.

Translations

 * Estonian:
 * Finnish:
 * Icelandic: X-litningur
 * Irish: X-chrómasóm
 * Romanian: cromozom X
 * Swedish: