Definition of "sickle"

(agriculture) An implement having a semicircular blade and short handle, used for cutting long grass and cereal crops.  examples

Any of the sickle-shaped middle feathers of the domestic cock.  examples

(agriculture, transitive) To cut with a sickle.  examples

(transitive) To deform (as with a red blood cell) into an abnormal crescent shape.  examples

(intransitive) Of red blood cells: to assume an abnormal crescent shape.  examples

Shaped like the blade of a sickle; crescent-shaped.  examples