athanor

[ ath-uh-nawr ]

/ ˈæθ əˌnɔr /

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noun Alchemy.

a digester furnace with a self-feeding fuel supply contained in a towerlike contrivance, ensuring a constant, durable temperature.

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Origin of athanor

1425–75; late Middle English ≪ Arabic at tannūr the furnace

The actual text of the Marrow of the Hermetic Philosophy mentions taking an alchemical “egg”—not further described—from an athanor, which is a type of furnace used for gentle heating over a long period of time.
Deciphering the Philosophers’ Stone: How Scientists Cracked a 400-Year-Old Alchemical Cipher|Richard Bean|October 28, 2021|Singularity Hub
The draught affects the furnace—my Athanor, as we adepts term it.
Auriol|W. Harrison Ainsworth
A, shows an athanor (or digesting furnace) and a couple of digesting vessels.
Alchemy: Ancient and Modern|H. Stanley Redgrove
Or Athanor, a chemical stove, which works on for a long time without poking.
Titan: A Romance v. 1 (of 2)|Jean Paul Friedrich Richter

We know of the athanor of the alchemists of the middle ages.
Inventions in the Century|William Henry Doolittle