Origin: 1650–60; < Latinhierāticus < Greekhierātikós pertaining to the priesthood, priestly, equivalent to hierā-, variant stem of hierâsthai to perform priestly functions (verbal derivative of hierós sacred; see hiero-) + -ikos-ic, with -t- by analogy with derivatives from agent nouns in -tēs (cf. athlete, athletic)
1656 (implied in hieratical), from Gk. hieratikos, from hierateia "priesthood," from hierasthai "be a priest," from hiereus "priest," from hieros "sacred."