• (a.) Written in, or pertaining to, hierograms; expressive of sacred writing.
Hi`er·o·gram'mat'ic adjective [ Confer French hiérogrammatique .] Written in, or pertaining to, hierograms; expressive of sacred writing. Bp. Warburton. 
hierogrammatic, hierogrammatical 1. Written in, or pertaining to, hierograms; expressive of sacred writing. 2. Of the nature of a hierogram, relating to or consisting of hierograms.