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viscous
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visibility
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visible radiation
vis·i·ble ra·di·a·tion


noun 
Definition:
 
radiation perceptible to human eye: radiation that falls within the range of wavelengths that can be detected by the human eye, e.g. sunlight
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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