1877 (Royal Soc.) 166 502 On adding some of Stokes's reagent the band of reduced, or oxygen-free, hæmoglobin appeared.
1933 14 340/1 Oxygen-free high-conductivity copper..that is now being commercially offered for the first time represents a notable achievement in electro-metallurgy.
1991 31 Aug. 20/3 In this test, half of a sample of tumour cells are exposed to the drug while being incubated in air, and the other half are exposed in an oxygen-free atmosphere.