sick·le 
(sĭkəl)
(sĭkəl)n.
1. An implement having a crescent-shaped blade attached to a short handle, used for cutting grain or tall grass.
2. The cutting mechanism of a reaper or mower.
v. sick·led, sick·ling, sick·les
v.tr.
1. To cut with a sickle.
2. To deform (a red blood cell) into an abnormal crescent shape.
v.intr.
To assume an abnormal crescent shape. Used of red blood cells.
adj.
Shaped like the blade of a sickle; crescent-shaped: a sickle moon.
[Middle English sikel, from Old English sicol, from Vulgar Latin sicila, from Latin sēcula; see sek- in the Appendix of Indo-European roots.]
sickle