an alchemist's oven or furnace that continuously supplies its own fuel and thereby sustains an unchanging temperature
athanor in American English
(ˈæθəˌnɔr)
noun
Alchemy
a digester furnace with a self-feeding fuel supply contained in a towerlike contrivance, ensuring a constant, durable temperature
Word origin
[1425–75; late ME ‹‹ Ar at tannūr the furnace]This word is first recorded in the period 1425–75. Other words that entered Englishat around the same time include: control, expression, scratch, survey, track