writing ink

noun

: ink that is to be used with a pen and that may be permanent (as a blue-black ink) consisting essentially of a dispersion of gallic acid or tannin, ferrous sulfate, and often a blue dye in water or nonpermanent containing soluble dyes and including washable inks compare india ink sense 2

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!