密室,密事
Penetralia \Pen`e*tra"li*a\, n. pl. [L., fr. penetralis penetrating, internal. See {Penetrate}.] 1. The recesses, or innermost parts, of any thing or place, especially of a temple or palace. 2. Hidden things or secrets; privacy; sanctuary; as, the sacred penetralia of the home.
penetralia n : the innermost parts [also: {penetralium} (pl)]