WordReference Random House Learner's Dictionary of American English © 2026
ˈY ˌchro•mo•some,  n. [countable]
  1. Geneticsa sex chromosome of humans and most mammals that is present only in males and is paired with anXchromosome. Compare X chromosome.

WordReference Random House Unabridged Dictionary of American English © 2026
Y chromosome, [Genetics.]
  1. Geneticsa sex chromosome of humans and most mammals that is present only in males and is paired with anXchromosome. Cf. X chromosome. 
  • 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::
Y-chromosome n
  1. the sex chromosome that occurs as one of a pair with the X-chromosome in the diploid cells of the males of many animals, including humans
    Compare X-chromosome
'Y chromosome' also found in these entries (note: many are not synonyms or translations):
sex chromosome - X-chromosome - Y-chromosome - HY antigen - male - X chromosome

Forum discussions with the word(s) "Y chromosome" in the title:


Look up "Y chromosome" at Merriam-Webster
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