Added 9 October 2026 shoreline noun Categories: NatureRare Words noun ! Definition from WordNet 3.1, Princeton University. More about shoreline at Wordnik → Where our words come from → A boundary line between land and water. Origin From shore + line. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: seasideforeshorecoastseashorecoastlinenearshorelakeshorecoastalbeachseaboardshorewaterfront Back to today's word