• (a.) Within the nucleus of a cell; as. the intranuclear network of fibrils, seen in the first stages of karyokinesis.
In`tra·nu'cle·ar adjective (Biol.) Within the nucleus of a cell; as. the intranuclear network of fibrils, seen in the first stages of karyokinesis. 
Type: Term Pronunciation: in′tră-nū′klē-ăr Definitions: 1. Within the nucleus of a cell.
intranuclear 1. Existing or occurring within the nucleus of an atom or within the nucleus of a cell. 2. Within the nucleus of a cell; as, the intranuclear network of fibrils, seen in the first stages of karyokinesis (series of active changes that take place in the nucleus of a living cell in the process of division).
existing or taking place within a nucleus.