Y chromosome
Origin
Named by Nettie Stevens in 1905 using the next letter in sequence following the naming by Hermann Henking in 1890 of the X chromosome. 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.
David Bainbridge, The X in Sex: How the X Chromosome Controls Our Lives, pages 65-66, ISBN 0674016211.
Alternative forms
Full definition of Y chromosome
Noun
Y chromosome
(plural Y chromosomes)- (genetics) A mammalian sex chromosome, occurring only in male cells. Cells of females have a pair of X chromosomes while cells of males have an X and a Y.