Also found in: Medical.


(rā`zēz) or


(rā`sĭs, –zĭs), 860–932, Persian physician. He was chief physician at the Baghdad hospital. An observant clinician, he formulated the first known description of smallpox as distinguished from measles in a work known as Liber de pestilentia (tr. A Treatise on Smallpox and Measles, 1848). His works were widely circulated in Arabic, and Greek versions and were published in Latin in the 15th cent. They include a textbook of medicine called Almansor and an encyclopedia of medicine compiled posthumously from his papers and known as Liber continens.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(or Rasis; Latin forms of Razi; full Arabic name, Abu Bakr Muhammad Ibn Zakariya al-Razi). Born 865 in Rey; died there 925 or 934. Iranian scholar, encyclopedist, physician, and philosopher; rationalist and freethinker.

Rhazes supervised clinics first in Rey and later in Baghdad. He was very familiar with the science, medicine, and philosophy of antiquity. He apparently wrote some 184 works in all, of which 61 have come down to us. These works dealt with philosophy, ethics, theology, logic, medicine, astronomy, physics, and chemistry (alchemy). His works were translated into Latin in Europe between the tenth and 13th centuries.

Rhazes’ scientific studies are characteristically free of dogmatism, utilize experimentation, and display a practical orientation. His philosophical thought, resembling certain kinds of gnosticism, is based on a doctrine of five eternal principles: creator, soul, matter, time, and space. Reason, sent by the creator, inspires the soul, which is imprisoned by matter, to strive for liberation; the path to liberation is the study of philosophy. The atomism of Rhazes is similar to that of Democritus. Rhazes believed in absolute space and absolute time, and he accepted the existence of a multiplicity of worlds. In ethics, he attacked asceticism and urged an active life in society, on the model of Socrates.

Rhazes sharply criticized all the religions that existed in his time. He wrote the antireligious treatise Mashariq al-anbiya (The Dawn of the Prophets), which evidently served as the basis for the medieval Latin lampoon entitled De tribus impostoribus. According to Rhazes, truth was one but religions were many; consequently, all religions were false, and one should read not Scripture, but the books of philosophers and scientists. His antireligious statements provoked fierce attacks by Muslim thinkers of the tenth and 11th centuries, particularly Farabi.


Rhazes’ principal medical works are al-Hawi (Continent of Medicine) and the ten-volume Book of Medicine Dedicated to Mansur. They are unique medical encyclopedias in Arabic; translated into Latin, they served as a guide to physicians for centuries. In On Smallpox and Measles (Russian translation in V. O. Gubert, Smallpox and Smallpox Vaccination, vol. 1, St. Petersburg, 1898), Rhazes gave a classic description of these diseases, noting immunity to repeated infection; he is known to have made use of vaccination (variolation).

Rhazes is believed to have introduced the practice of writing a medical history for each patient. He was the first to describe an instrument for removing foreign bodies from the pharynx and one of the first to use cotton wadding in bandaging and catgut in sewing up wounds. He drew up instructions for equipping hospitals and choosing hospital sites. Among his other works are One Physician Cannot Cure All Diseases, which takes up the importance of specialization among doctors, and Medicine for Those Who Have No Doctor, about medical aid and self-help for the poor.



Epître de Beruni contenant le répertoire des ouvrages de Muhammad b. Zakariya ar-Razi. Published by P. Kraus. Paris, 1936.
Abu Bekr Muhammedis fillii Zachariae Raghensis (Razis): Opera philoso-phica fragmentaque quae supersunt, part 1. Collected and edited by P. Kraus. Cairo, 1939.
Nadjmabadi, M. Bibliographie de Razes. Tehran, 1960.
Razi, ibn Zakariya al-, Muhammad. Al-Sirat al-falsafiya. Edited by P. Kraus. Tehran, 1964.
Mohaghegh, M. Filseif-i-Rayy Muhammad Ibn-i-Zakariya-i-Razi. Tehran, 1974.
In Russian translation:
Karimov, U. I. Neizvestnoe sochinenie ar-Razi: “Kniga tainy tain.” Tashkent, 1957.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Rhazes developed several chemical instruments that remain in use to this day.
The initial identified writings concerned were Arabic remedial treatises written during the "Arab Agricultural Revolution", by writers such as Alkindus, Costa ben Luca, Rhazes, Ibn Al-Jazzar, al-Tamimi, al-Masihi, Avicenna, Ali ibn Ridwan, Isaac Israeli ben Solomon, Abd-el-latif, and Ibn al-Nafis.
Later, PM was flourished by Persian scholars like Avicenna and Rhazes in the early Islamic era (9-12th century AD, called as Islamic Golden Age) and became the main paradigm of medicine (as holistic and humoral medicine) whole around the world until 17th century AD (Zarshenas et al.
It was then described by Vegabhatt (India 300 AD), Paul Aegineta (Greece-7th Century), Al Rhazes (Arabia-932 AD), Avicenna (Greece 980-1036 AD) and Chakradatta (India-1060 AD).
La facultad de medicina se apoyaba en el Ars Medecinae, compilacion del siglo XI que comprendia obras de Hipocrates y Galeno, a las que se anadian las grandes sumas arabes: el Canon de Avicena, el Correctorium de Averroes y el Almansor de Rhazes. Las sesiones estaban basadas en los comentarios a estos y otros textos, pero eran disputadas entre profesores y alumnos.
Rhazes Health & Beauty, Rhazes Corporation, 1313 E Maple St., Bellingham, WA 98225.
Abu Bakr Muhammad Ibn Sazariya Razi also known as Rhazes (865-925)
The most notable ancient medical descriptions are texts from Egypt (Imhotep, Edwin Smith Papyrus, Ebers Papyrus, Kahun Gynecological Papyrus), Mesopotamia (Diagnostic Handbook, Alkindus, De Gradibus), India (Ayurveda, Sushruta Samhita, Charaka Samhita), China (Yellow Emperor, Huangdi Neijing), Greece (Iliad and Odyssey are the earliest sources of Greek medical practice; Hippocratic medicine), Persia (Rhazes, Avicenna, The Canon of Medicine, The Book of Healing), Spain (Abulcasis, Kitab al-Tasrif) and Syria (Ibn al-Nafis, Commentary on Anatomy in Avicenna's Canon, Comprehensive Book on Medicine).
Al Kindi, Al Ghazali, Rhazes, Avicenna and Averroes) built their theories of medicine and psychology around a framework based on teachings from the Quran and the Hadith.
"In the school of medicine at the University of Paris hang two portraits of Moslem physicians--'Rhazes [al-Razi] and Avicenna.'" (9)
The arguments stated above are true for all ancient people including many eminent scholars like Rhazes, Khayyam and Anvari.