tar base

noun

: any of the organic bases (as aniline, pyridine, or quinoline) obtained especially from coal tar or ammonia liquor compare pyridine base

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