Added 9 October 2026 lubricant /ˈlubɹəkənt/ noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about lubricant at Wordnik → Where our words come from → A substance capable of reducing friction by making surfaces smooth or slippery. Related Words: lubricatorlubricationlubelubricatingoillotiongreaseointmentunguentunctionpetrolatum Back to today's word