Meaning
Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks.
Etymology
Origin: Unknown
From pi + -on, as alteration of pi-meson.
Synonyms & Antonyms
Synonyms
pi mesonneutronparticle
NYT Puzzle Appearances
No published puzzle dates on file for this word yet. It is part of the official NYT Spelling Bee word list for 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026.