sacellum

Etymology
Borrowed from.

Noun

 * 1) A small chapel, as a monument within a church.
 * 2)  In Ancient Rome, a shrine open to the sky, sometimes used for sacrificial purposes, or in honor of the divine.

Etymology
From, from the neuter of.

Noun

 * 1) A sanctuary dedicated to a deity, usually open to the sky
 * 2) A chapel
 * 1) A chapel