D defs.my
Entry 1 sense Webster, 1913

Sanctum

/săng'-ktəm/ · Sanc·tum · IPA /ˈsæŋktəm/
01 n. A sacred place; hence, a place of retreat; a room reserved for personal use; as, an editor's sanctum.
  1. 1.
    A sacred place; hence, a place of retreat; a room reserved for personal use; as, an editor's sanctum.
Phrases & compounds
Sanctum sanctorum — the Holy of Holies; the most holy place, as in the Jewish temple.