Z chromosome

noun

: a sex chromosome of the kind occurring doubled in the male and singly either with or without a W chromosome in organisms (as moths) in which the female is heterogametic compare x chromosome

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now