ester gum

noun

: a resinous ester or mixture of esters made by combining a resin of acid nature or resin acids with a polyhydric alcohol

especially : a hard usually pale substance made by heating rosin with glycerol and used in varnishes, lacquers, and printing inks

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