creosote
🇺🇸
/ˈkriːəsəʊt/
🇬🇧
/ˈkriːəsəʊt/
A dark, oily liquid made from coal tar, used to protect wood from rotting.
The old fence posts were preserved for years by applying creosote.
To treat something, especially wood, with creosote to prevent decay.
The wooden beams were creosoted to ensure they lasted longer.