| hard contact lens |
A contact lens made of rigid translucent materials.
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| hard keratin |
Keratin found in the hair and nails.
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| hard metal disease |
A respiratory disorder caused by the inhalation of cobalt and metal carbides, esp. tungsten carbide. Its primary symptoms are cough and breathlessness during exertion. Lung biopsies show markedly abnormal giant cells in the in
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| hard ray |
An x-ray photon of short wavelength and great penetrative power.
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| hard solder |
A solder that is used in dentistry, has a high fusion point, and is stronger and more tarnish-resistant than softer, low-melting-point solders.
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