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| Ambrosia An aromatic herb, likely Oak of Cappadocia 373.6 | Anemone Windflower 378.29 |
| Amaranth original: "Amarantum" 373.16 | Dill original: "Anethum" 379.8 |
| Marjoram original: "Amaracon" 373.2 | Anthyllis A herb used for wounds, possibly Kidney Vetch 379.29 |
| Alum: fibrous, round, and moist original: "Alumen fissile, rotundum & humidum" 613.11 | Anise original: "Anisum" 380.14 |
| Amomum An aromatic spice plant 376.27 | Chamomile original: "Anthemis" 380.7 |
| Ammoniacum A medicinal gum resin 376.21 | Snapdragon original: "Antirrinum" 380.20 |
| Olive oil dregs original: "Amorge"; the watery sediment of olive oil 373.25 | Antispodium A medicinal substitute for metallic ash 611.25 |
| Wild vine original: "Ampelos agria" 374.24 | To turn about and to turn back original: "Ἀντιστρέφειν καὶ ἀναστρέφειν"; likely referring to logical or physical inversion 74.13 |
| Cultivated vine original: "Ampel. hemeros" 375.2 | Cleavers original: "Aparine"; also known as goosegrass 380.26 |
| White vine original: "Ampelos leuce"; typically refers to White Bryony 375.4 | Yellow vetchling original: "Aphace" 388.7 |
| Black vine original: "Ampel. melena"; typically refers to Black Bryony 375.17 | Foam of nitre original: "Aphrolitrum"; an efflorescence of soda 593.20 |
| Wild leek original: "Ampeloprason" 374.9 | Parsley-leafed plant original: "Apiroselinus" 582.2 |
| Olive oil lees original: "Amurca" 373.24 | Celery or Parsley original: "Apium" 519.13 |
| Pimpernel original: "Anagallis" 377.3 | Dogbane original: "Apocynum" 381.16 |
| Stinking bean-trefoil original: "Anagyrus" 377.12 | Water, though it is thin, does not of itself heat things 25.20 |
| Vivisection of the living: if performed by kings upon men condemned to death, no serious crime is committed This refers to the controversial ancient practice of Alexandria physicians Herophilus and Erasistratus 226. throughout | Water with wine quenches thirst more effectively than if drunk alone 49.29 |
| Anaxagoras said that snow was not white A famous philosophical paradox regarding the nature of matter and perception 71.3 | Which waters irritate ulcers 12.28 |
| Alkanet original: "Anchusa"; a plant used for red dye 363.16. & 364.2 | Water is digested more quickly than oil 26.10 |
| Purslane original: "Andrachme" 378.7 | The properties of water original: "Aquæ facultas" 7. throughout |
| Sea-navelwort original: "Androsaces" 378.2 | Things which boiling water burns are not rendered dry 15.13 |
| Tutsan original: "Androsæmum"; literally "man's blood" due to its red sap 377.21 |