| odometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, milometer |
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| odonate | (noun) large primitive predatory aquatic insect having two pairs of membranous wings | - |
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| odontalgia | (noun) an ache localized in or around a tooth | Synonyms: toothache |
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| odontiasis | (noun) the eruption through the gums of baby teeth | Synonyms: dentition, teething |
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| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| odontology | (noun) the branch of medicine dealing with the anatomy and development and diseases of the teeth | Synonyms: dental medicine, dentistry |
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| odor | (noun) any property detected by the olfactory system | Synonyms: aroma, odour, olfactory property, scent, smell |
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| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odour, olfactory perception, olfactory sensation, smell |
| odour | (noun) any property detected by the olfactory system | Synonyms: aroma, odor, olfactory property, scent, smell |
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| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odor, olfactory perception, olfactory sensation, smell |