The term 'tar-free' is a compound word formed by combining 'tar,' a sticky substance derived from coal or wood, with 'free,' indicating the absence of something.

The word 'tar' comes from Old English 'teoru,' while 'free' comes from Old English 'frēo,' meaning 'not in bondage.'

Initially, 'tar-free' was used to describe products without tar, and this meaning has remained consistent.