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Webster 1913 Edition

Adj.

[Cf. F.

hiérogrammatique

Written in, or pertaining to, hierograms; expressive of sacred writing.

Bp. Warburton.

Adj.

[Gr. sacred, and letter.] Denoting a kind of writing in sacred or sacerdotal characters, used only by the priests in Egypt.

hierogrammatic ‎(not comparable)

Written in, or pertaining to, hierograms; expressive of sacred writing.
(Can we find and add a quotation of Bishop Warburton to this entry?)