Added 10 October 2026 sub-surface adjective Categories: Obscure Words adjective ! Definition from Wiktionary (CC BY-SA). More about sub-surface at Wordnik → Where our words come from → Alternative spelling of subsurface. Related Words: groundbelowgroundundergroundsubterraneansubsurfacesubmergedsubseaunderwaterunderseasubmarinegroundwaterscuba Back to today's word