double-red blood
 n.— «Students can also donate red blood cells only. The process is more intensive and involves taking blood from a donor, extracting the red blood cells and then putting the rest of the blood back into the donor. This process is called double-red blood.» —“Hoxworth takes blood from students” by Thomas Demeropolis in University of Cincinnati News Record (Cincinatti, Ohio) Oct. 19, 2005. (source: Double-Tongued Dictionary)

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