Added 9 October 2026 hardpan noun Categories: NatureRare Words noun ! Definition from Wiktionary (CC BY-SA). More about hardpan at Wordnik → Where our words come from → A distinct layer of soil that is largely impervious to water. Synonym of dry lake. Origin From hard + pan. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: calicheclayduripanhardgroundclaypanhardrockortsteinstonelayerinceptisolaquandaquiferbaserock Back to today's word