Wikipedia
Usage examples of "theatrum".
Section headings are taken from The Compound of Alchymie by Sir George Ripley, collected in Theatrum Chemicum Brittanicum by Elias Ashmole in 1652.
I also personally escorted her to games at the Colosseum, plays at the Theatrum Marcelli and other such diversions, because I could see that she was not in very high spirits.
Father Caspar describes it as a “Sphynx Mystagoga, an Oedipus Aegyp-tiacus, a Monad leroglyphica, a Clavis Convenientia Lin-guarum, a Theatrum Cosmographicum Historicum, a Sylva Sylvarum of every alphabet natural and artificial, an Archi-tectura Curiosa Nova, a Combinatory Lamp, Mensa Isiaca, Metametricon, Synopsis Anthropoglottogonica, Basilica Cryp-tographica, an AmphiTheatrum Sapientiae, Cryptomenesis Patefacta, Catoptron Polygraphicum, a Gazophylacium Ver-borum, a Mysterium Artis Steganographicae, Area Arithmo-logica, Archetypon Polyglotta, an Eisagoge Horapollinea, Congestorium Artificiosae Memoriae, Pantometron de Furtivis Literarum Notis, Mercurius Redivivus, and an Etymologicon Lustgartlein!
That this City house was one of only three in the world equipped with a complete Patent Cosmo-Opticon or Theatrum Mundi in more-or-less working order, Hawksquill had known before she bought it.