regulant

noun

reg·​u·​lant

-lənt

plural -s

: a substance or agent that regulates something (as plant growth)

Word History

Etymology

regulate + -ant

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