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hardness [hardnesses]▼(quality of being hard)noun[UK: ˈhɑːd.nəs] [US: ˈhɑːrd.nəs]
sclerometer [sclerometers]▼(device used to measure hardness)noun[UK: sklərˈɒmɪtə] [US: sklərˈɑːmɪɾɚ]
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