| OX | any of various wild bovines especially of the genera Bos or closely related Bibos |
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| OX | an adult castrated bull of the genus Bos |
| OX | having large round eyes like those of an ox |
| OX | tall leafy-stemmed Eurasian perennial with white flowers |
| OX | a form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococci |
| OX | a salt or ester of oxalacetic acid |
| OX | an acid formed by oxidation of maleic acid (as in metabolism of fats and carbohydrates) |
| OX | a salt or ester of oxalic acid |
| OX | a toxic colorless crystalline organic acid found in oxalis and other plants |
| OX | a family of widely distributed herbs of the order Geraniales |
| OX | any plant or flower of the genus Oxalis |
| OX | Eurasian plant with heart-shaped trifoliate leaves and white pink- or purple-veined flowers |