Added 10 October 2026 monophoton noun noun ! Definition from Wiktionary (CC BY-SA). More about monophoton at Wordnik → Where our words come from → A single photon (rather than a group) Origin From mono- + photon. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: photonmonoparticlesuperphotonsuper-photonphotopairsingletbiphotonphotodetectiontriphotonantiphotonphotoneutron Back to today's word