reference samplereflactionreflectancereflectance valuereflection of lightreflexreflexionrefluxreformingrefractionrefractive indexrefractomerrefractoryrefrasilrefrigerationregainregenarated protein fibreregenated fibreregeneratedregenerated celluloseregenerated cellulose fibreregenerated cellulose filmregenerated fiberregenerated fibreregenerated materialregenerationregenerativeregionregularregular basket weaveregular healdregular nylonregular sateenregular threadregular twillregularityregulateregulationregulatorreinerreinforcereinforcedreinforced plasticreinforcementreinforcerrelationrelativerelative breaking loadrelative concentrationrelative dielectric constant