n. [ Pref. in- not + fusibility: cf. F. infusibilité. ] Incapability or difficulty of being fused, melted, or dissolved; as, the infusibility of carbon. [ 1913 Webster ]
n.; pl.Invisibilities [ L. invisibilitas: cf. F. invisibilité. ] The state or quality of being invisible; also, that which is invisible. “Atoms and invisibilities.” Landor. [ 1913 Webster ]