Definitions
1.nounAn implement having a semicircular blade and short handle, used for cutting long grass and cereal crops.
2.nounAny of the sickle-shaped middle feathers of the domestic cock.
3.verbTo cut with a sickle.
4.verbTo deform (as with a red blood cell) into an abnormal crescent shape.
5.verbOf red blood cells: to assume an abnormal crescent shape.