tar still

noun

: a still in which tar or similar material is distilled: such as

a

: a still in which the heavy residuum from the first distillation in petroleum refining is rectified compare crude still

b

: an apparatus for testing especially tars and asphalt

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!