Added 9 October 2026 neptune /ˈnɛptjuːn/ noun Categories: PeopleNatureRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about neptune at Wordnik → Where our words come from → A brass or copper pan used to evaporate salt water to obtain salt. Related Words: saturnuranusnorthwindposeidonseaoceanmarinemaritimeaquaticpelagicdeepbriny Back to today's word