Lightning (Japanese sword) - Inazuma

Japanese: 稲妻(日本刀) - いなずま
Lightning (Japanese sword) - Inazuma

...These include clove-like and rod-shaped steels. The ones that have different types of steel mixed together and shine strongly in a line are called "jikei" (those on the ground), "inazuma" (those on the blade), and "kinsuji" (those on the blade).
[Carvings]
Carvings on the blade include "boubi" (carved all over the ridgeline) and "nisujihi" (two grooves carved side by side into the ridgeline) for tachi and katana, while "goma-hashi" (two thin rod-like objects), "suken" (a sword without a handle, although some have handles), and "kurikaryu" (a dragon that wraps around the sword and tries to swallow the head) are common for short swords.

*Some of the terminology that refers to "Lightning (Japanese sword)" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これには丁子様の映や棒状の棒映がある。異質の鋼が交じって線状に強く光るものを〈地景〉(地にあるもの),〈稲妻〉(刃にあるもの),〈金筋〉という。
[彫物]
 刀身に施した彫刻には,太刀や刀には〈棒樋(ぼうび)〉(鎬地の全面を彫る),〈二筋樋〉(鎬地に2本の樋を並べて彫ったもの)などがあり,短刀には〈護摩箸(ごまはし)〉(2本の細い棒状のもの)と〈剣(すけん)〉(柄(つか)のない剣のことであるが,柄付のものもある),〈くりから竜(俱梨伽羅竜)〉(剣にからまりつき剣頭をのみこもうとするもの)などが多い。…

※「稲妻(日本刀)」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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