Greek core word #223 · adjective · 73 times in the New Testament

ἱερός

hih-eh-ROS

ἱερός, ἱερά, ἱερόν — holy; τὸ ἱερόν the temple

2-1-2 adjective with feminine in -α after ρ (ἱερός, ἱερά, ἱερόν).
In the NT almost always the neuter noun τὸ ἱερόν “the temple (precinct)”; τὰ ἱερά “sacred things”.

Forms in bold occur in the New Testament; the others complete the pattern. A dash (—) marks a form that does not exist.

	Masc. sg	Fem. sg	Neut. sg	Masc. pl	Fem. pl	Neut. pl
Nom	ἱερός	ἱερά	ἱερόν	ἱεροί	ἱεραί	ἱερά
Gen	ἱεροῦ	ἱερᾶς	ἱεροῦ	ἱερῶν	ἱερῶν	ἱερῶν
Dat	ἱερῷ	ἱερᾷ	ἱερῷ	ἱεροῖς	ἱεραῖς	ἱεροῖς
Acc	ἱερόν	ἱεράν	ἱερόν	ἱερούς	ἱεράς	ἱερά

Where you meet it

First met in passage 83, John 7:14.