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sickle
A sickle is a hand-held agricultural tool with a variously curved blade typically used for harvesting grain crops or cutting succulent forage chiefly for feeding livestock (either freshly cut or dried as hay).
A great diversity of types is used across many cultures. Between the dawn of the Iron Age and present, hundreds of region-specific variants of this basic forage-cutting tool were forged of iron, later steel.
One noteworthy feature of sickles is that their edges have been made in two very distinct manners/patterns - smooth or serrated. While both can (albeit with a different technique) be used for cutting either green grass or mature cereals, it is the serrated sickle that still dominates the duty of harvesting grain - with other words the "reaping". Modern kitchen knives with serrated edges, as well as grain-harvesting machines use the same design principle as prehistoric sickles.
== History ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「sickle」の詳細全文を読む
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