A hypothetical or actual substance believed to work against the accumulation of excess fluid in body tissues.
From anti- (against) + hydro- (water) + -in (chemical suffix). This appears to be a medical or pharmaceutical term from the late 19th or early 20th century, modeled after other drug names ending in -in like quinine and aspirin.
This word shows how scientists used to invent chemical names by combining Greek roots and adding -in, hoping to create drugs that sounded scientific—many of these named compounds never became real medicines, but the naming pattern stuck around for actual drugs.
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