In a manner that promotes or relates to increased urination; acting as a diuretic.
Formed by adding the adverbial suffix '-ly' to 'diuretical,' continuing the pattern of medical terminology formation common in 18th-century scientific writing.
Adding '-ly' to make adverbs is one of English's most productive word-building tricks—you can take almost any adjective and add it to describe how something happens. Here, it means 'in a diuretic manner,' but this form is virtually obsolete in modern medical practice.
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