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sickle  (sickles plural )A sickle is a tool that is used for cutting grass and grain crops. It has a short handle and a long curved blade.  n-count 
sickle-cell anaemia  
in AM, use  sickle-cell anemia  
Sickle-cell anaemia is an inherited illness in which the red blood cells become curved, causing a number of health problems.  n-uncount