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In alchemy, an athanor is a furnace used to provide a uniform and constant heat for alchemical digestion. Etymologically, it descends from a number of Arabic texts of the period of the Califate which use the term "al-tannoor" in talismanic alchemy, meaning a bread-oven, from which the design portrayed evidently descends.
The athanor was also called Piger Henricus ("Slow Henry"), because it was chiefly used in slower operations, and because when once filled with coals, it keeps burning a long time. For this reason the Greeks referred to it as "giving no trouble", as it did not need to be continually attended. It was also called the Philosophical furnace, Furnace of Arcana, or popularly, the Tower furnace. 
Athanor is also the name a series by American author Jane Lindskold. The titles in this series are Changer, published in 1996, and Legends Walking, published in 1999.
Athanor is also the title of an artwork by Romanian artist Geta Bratescu (b. 1926), consisting of a photo collage dated from 1974 and currently part of the art collection of Instituto Inhotim, in Brazil.
Athanor is also the title of an artwork by Janet Saad-Cook located at Boston University's Photonics Center.
Athanor is now a review of language philosophy, history, and international politics. It is published once or twice a year. Its latest issue has been No. 13 (new series), November, 2009.
French composer Joël-François Durand composed an orchestral piece called Athanor from 2000 to 2001.
- This article incorporates text from a publication now in the public domain: Chambers, Ephraim, ed. (1728). "article name needed". Cyclopædia, or an Universal Dictionary of Arts and Sciences (first ed.). James and John Knapton, et al.