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grindstone▼(wheel for grinding)noun[UK: ˈɡraɪnd.stəʊn] [US: ˈɡraɪndˌstoʊn]
unit cell▼noun[UK: ˈjuː.nɪt sel] [US: ˈjuː.nət ˈsel]
photon [photons]▼(quantum of light)noun[UK: ˈfəʊ.tɒn] [US: ˈfoʊ.tɒn]
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