from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An abnormal, crescent-shaped red blood cell that results from a single change in the amino acid sequence of the cell's hemoglobin, which causes the cell to contort, especially under low-oxygen conditions.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an abnormal red blood cell that has a crescent shape and an abnormal form of hemoglobin
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