An instrument or device that measures the ductility of a material, particularly metals, by testing how far they can be drawn or stretched.
From 'ductile' plus '-meter' (from Greek 'metron,' measure). This is a technical scientific instrument term, combining Latin and Greek roots in the manner typical of scientific nomenclature.
A ductilimeter is a specialized tool that engineers use to ensure metals meet specifications—it's the kind of obscure instrument that seems boring until you realize it's testing if your airplane's fuselage will hold together!
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