Antidote. Something "given against." Originally, perhaps, an adjective, and in old medicine employed for various remedies; now limited to substances which will counteract the effect of poisons.
Apozems. Strong decoctions or infusions. A Greek word meaning "boiled off."
Aqua Mirabilis. Once a popular household remedy. Water distilled from cloves, cardamoms, cubebs, mace, ginger, and other spices.
Aquila Alba. An old name for calomel.
Arcana meant secrets. The original idea of the word was things shut up and protected as the occupants of Noah's Ark were shut up. The alchemists used the word arcanum freely, but it came to be applied to medicines of known composition but of mysterious action. Arcanum tartari was acetate of potash. Arcanum duplicatum was another name for the Sal de Duobus or sulphate of potash which was supposed to combine the virtues of nitre and vitriol.
Athanor was a self-supplying furnace, the coals or fuel being provided in a reservoir above the fire and intended to be supplied to the furnace automatically.
Balm and Balsam, which are words with the same origin, have always been suggestive of medicinal and healing virtues. Probably balsam has descended through the Greek and Latin from Semitic terms meaning spices. The Hebrew Besem or Bosem, often translated "spices," in one place "cinnamon," in another "calamus," always meant some grateful aromatic. But the opobalsamum or juice of the Balsam tree, the famous Balm of Gilead, was Tsori in Hebrew. Old etymologists, supported by Littré and other moderns, consider that Baal-schaman, prince of oils, was the original word from which balsam was derived. The Arabic Abu-scham, father of perfumed
