Word Meanings - PENETRAIL - Book Publishers vocabulary database

Penetralia. Harvey.

HARVEY PROCESS
A process of hardening the face of steel, as armor plates, invented by Hayward A. Harvey of New Jersey, consisting in the additional carburizing of the face of a piece of low carbon steel by subjecting it to the action of carbon under long-continued
PENETRALIA
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.