(1)any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1
(2)陽子と同程度またはそれ以上の質量の粒子で強い相互作用にあずかる素粒子の総称
(3)バリオン数プラス1のハドロン