Added 10 October 2026 dah /dɑː/ noun Categories: LanguageRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about dah at Wordnik → Where our words come from → The longer of the two telegraphic signals used in Morse code. Origin Imitative From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: dashyesdityeahzipdoodhacoodeemorse Back to today's word