noun
Usage: usually capitalized X
: a sex chromosome that carries factors for femaleness and usually occurs paired in each female zygote and cell and single in each male zygote and cell — compare y chromosome , z chromosome
noun
Usage: usually capitalized X
: a sex chromosome that carries factors for femaleness and usually occurs paired in each female zygote and cell and single in each male zygote and cell — compare y chromosome , z chromosome
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012