D defs.my
Entry 1 sense Webster, 1913

Irresolvable

· Ir·re·solv·a·ble · IPA /ɪɹɪˈzɒlvəb(ə)l/
01 a. Incapable of being resolved; not separable into component parts.
  1. 1.
    Incapable of being resolved; not separable into component parts.
Phrases & compounds
Irresolvable nebulæ — nebulæ of a cloudlike appearance, which have not yet been resolved by the telescope into stars, and are often distant galaxies. See galaxy{2}.