| orad | (adverb) toward the mouth or oral region | - |
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| orally | (adverb) by spoken rather than written means | Synonyms: by word of mouth |
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| (adverb) (of drugs) through the mouth rather than through injection; by mouth | - |
| ordinarily | (adverb) under normal conditions | Synonyms: commonly, normally, unremarkably, usually |
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| organically | (adverb) involving carbon compounds | - |
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| (adverb) as an important constituent | - |
| (adverb) in an organic manner | - |
| organizationally | (adverb) with regard to organization | - |
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| originally | (adverb) in an manner suggesting originality | - |
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| (adverb) with reference to the origin or beginning | Synonyms: in the beginning, primitively |
| (adverb) before now | Synonyms: earlier, in the beginning, in the first place, to begin with |
| ornamentally | (adverb) in an ornamental, nonfunctional manner | - |
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| ornately | (adverb) in an ornate manner | - |
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