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| Sulfurous and nitrous waters are all hostile to hot conditions 12.2 | Plantain original: "Arnoglossum"; literally "lamb's tongue," used to treat wounds 383.21 |
| Muddy water is a composite substance 9.23 | Mugwort original: "Artemisia" 385.4 |
| Sea water, and when it has a cooling effect 8.8 | Dilated arteries draw in not only air, but whatever else is easily drawn 20.27 |
| Water is common and necessary to all 6.23 | Where the use of artificial simple medicines is established 43.29 |
| Drinkable water cools even when lukewarm 8.11 | Cuckoopint original: "Arum" 384.24 |
| Of all waters, only drinkable water is truly moist 12.9 | Armenian stone original: "Armeniacum"; likely referring to lapis Armenius, a blue mineral used in medicine and as a pigment 592.17 |
| The water which Hippocrates considers the lightest 28.18 | Asarabacca original: "Asarum"; a ginger-like root used as an emetic 385.13 |
| The differences between waters 8.1 | Milkweed original: "Asclepias" in the same place [385].18 |
| Water is thin, moist, and soft 25.14 | Camel's thorn original: "Aspalathos" in the same place [385].21 |
| Things that grow in salty waters 719.11 | Asparagus in the same place [385].28 |
| Arabian stone original: "Arabius"; likely lapis Arabus, used to treat hemorrhoids 587.4 | Asphalt original: "Asphalton"; bitumen used for its drying and binding properties 723.16 |
| Strawberry tree original: "Arbutus" 453.9 | Asphodel original: "Asphodelus" 387.7 |
| Juniper original: "Arceutus"; from the Greek arkeuthos 382.27 | Assian stone original: "Assius"; a stone from Assos in Troas used to consume proud flesh 585.5 |
| Burdock original: "Arcium" 383.3 | Stavesacre original: "Astaphis"; a type of wild larkspur used against lice 386.28 |
| Prickly poppy original: "Argemone" 381.15 | Spleenwort original: "Asplenum" in the same place [386].8 |
| Orpiment original: "Arrhenicum"; a yellow arsenic sulfide mineral 593.11 | Starwort original: "Aster atticus" in the same place [386].20 |
| Friar's cowl original: "Arisarum" 381.28 | Milk-vetch original: "Astragalos" 386.12 |
| Birthwort original: "Aristolochia" 382.2 | King Attalus Attalus III of Pergamon, known for his studies of medicinal plants and poisons 624.23 |
| Distaff thistle original: "Atractilis" 387.13 |
| | Writing ink original: "Atramentum scriptorium" 605.3 |
| | Shoemaker's ink original: "Atramentum sutorium"; typically iron sulfate or vitriol used for blackening leather 614.15 |
| | Orach original: "Atraphaxys" 387.17 |
| | Saltbush original: "Atriplex" in the same place [387]. |