In a manner relating to or affecting the abdomen; through, by means of, or with respect to the abdominal region.
From English 'abdominal' (relating to the belly) with the adverb suffix '-ly' (in the manner of). Built from Latin 'abdominalis' combined with Germanic adverbial ending.
Medical adverbs like 'abdominally' create a specialized register—saying a drug was 'administered abdominally' sounds far more professional than saying 'put in the belly,' even though they mean the same thing.
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