A laboratory assistant or helper, especially one who works in a medical or scientific laboratory.
From German 'Diener' (servant), derived from Old High German 'deno' meaning servant. The term entered English through German academic and medical institutions in the 19th century.
In German universities, a Diener held much more prestige than a simple 'helper'—these were skilled assistants who often had extensive knowledge and ran the day-to-day operations of labs, making them indispensable to research.
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