Hieros
Hieros is an Ancient Greek word meaning sacred or holy. Used as an adjective, it describes things dedicated to the gods or set apart for cultic use. In grammatical terms, the related noun hieron referred to a temple or sacred place, and the term appears in other forms connected to sacred matters. The root ἱερός is the source of many Greek religious terms and compounds that entered later scientific and scholarly vocabulary.
In English, hieros survives primarily as a linguistic root in a broad family of words connected with
Overview and usage: Hieros functions primarily as an etymological root in discussions of ancient Greek religion