Added 9 October 2026 mainmast /ˈmeɪn.mɑːst/ noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about mainmast at Wordnik → Where our words come from → The chief mast of a sailing vessel with two or more masts. Origin From main + mast. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: aftsprungshroudstopmastsupermastmainsailforetopmasttopgallanttop-flag Back to today's word