a. [ Pref. ir- not + resolvable. Cf. Irresoluble. ] Incapable of being resolved; not separable into component parts. [ 1913 Webster ]

Irresolvable nebulæ (Astron.), nebulæ of a cloudlike appearance, which have not yet been resolved by the telescope into stars, and are often distant galaxies. See galaxy{ 2 }. Sir W. Herschel. [ 1913 Webster +PJC ]

n. The quality or state of being irresolvable; irresolvability. [ 1913 Webster ]