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| Mustard oil | 34 | Othonna | 208 |
| Storax oil | 55 | Nature of eggs | 122 |
| Turpentine oil | 36 | Egg white | ibidem |
| Pickled olives | 87 | Sour brine | 415 |
| Sea-rush | 325 | Monk’s rhubarb | 167 |
| Alexandrian parsley | 254 | Butcher’s broom | 367 |
| Unripe olive juice | 404 | P | |
| Honey of unripe olives | 419 | Paederota | 223 |
| Onagra | 358 | Peony | 294 |
| Onitis | 231 | Christ’s thorn | 76 |
| Sainfoin | 300 | Date palm | 92 |
| Rest-harrow | 223 | Wild palm | 93 |
| Onosma? | 289 | Theban palms | 92 |
| O? | 111 & 480 | Asclepius’s all-heal | 245 |
| Snake garlic? | 187 | Chiron’s all-heal | ibid. |
| Ophite stone? | 482 | Heraclean all-heal | 243 |
| Opium | 331 | Pancration | 201 |
| Balsam juice | 22 | Millet | 156 |
| Opopanax | 243 | Horned poppy | 333 & 505 |
| Round apples | 98 | Wild poppy | 330 |
| Mountain parsley | 263 | Garden poppy | ibid. |
| Origanum | 231 | Foam poppy | 334 |
| Wild origanum | ibid. | Pappi (down) | 512 |
| Ornithogalum | 183 | Papyrus | 74 |
| Broomrape | 182 | Paralios | 384 |
| Rice | 156 | Pardalianches | 342 |
| Bone-breaker (bird) | 123 | Whitlow grass | 326 |
| Ostracites | 483 | Feverfew | 293 |
| Osyris | 366 |