from Latin opertāneus, from opertus covered + -āneus ‘belonging to the class of’
1656 - Glossographia, Thomas Blount;
Opertaneous, done within doors, in secret or in cover
From: The Portfolio,
The Flowers of Literature.
The Spirit of the Magazines.
The Wonders of Nature and Art.
The Family Physician and Domestic Guide.
The Mechanic's Oracle.
Volume III, 1824
A Love Letter. From a Pedantic Schoolmaster.